Illness Anxiety Disorder

Key Takeaways

• Illness anxiety disorder is characterized by persistent and excessive worry about having or developing a serious illness, even in the absence of significant physical symptoms. This preoccupation with health concerns can significantly impair daily functioning and cause considerable distress for affected individuals.
• Symptoms of IAD often manifest as misinterpreting normal bodily sensations or minor symptoms as signs of severe disease. This intense anxiety can lead to compulsive behaviors such as frequent body checking, constant reassurance-seeking, obsessively researching symptoms and illnesses, or, in rare cases, avoiding medical care.
• Cognitive-behavioral therapy (CBT) is the primary treatment for health anxiety. Medication, such as SSRIs and SNRIs, may be used as a second-line treatment or in combination with therapy to manage the disorder, although in some individuals, pharmaceuticals can exacerbate distress.

Understanding Illness Anxiety Disorder

Illness anxiety disorder (IAD) is a psychiatric condition that presents as excessive concern about having or manifesting a major, undiagnosed clinical condition. Previously known as hypochondria (or hypochondriasis), individuals with the disorder experience ongoing fear or anxiety regarding their health, which can significantly impact daily life. ^[1]

This anxiety continues despite repeated reassurance from professionals, and despite physical exams or laboratory investigations revealing that there are no abnormalities. Individuals with IAD tend to focus excessively on ordinary bodily sensations (such as digestion or sweating) and mistakenly interpret them as signs of a serious, potentially life-threatening illness. ^[1]

Illness anxiety disorder is generally a long-term condition, with those affected often remaining skeptical of nonthreatening results and seeking opinions from multiple doctors for the same medical issue. People who have IAD may believe that their previous physicians were either incompetent or mistaken in their diagnosis, missing a serious condition that could lead to severe consequences. ^[1]

People with the disorder may also frequently inspect their bodies for signs of an illness, such as hair loss, wounds, or other physical changes. Individuals with illness anxiety may also dwell on thoughts of death or disability, and their intense focus on body-checking and health worries can severely affect their social and work-related functioning. ^[1]

Most people with illness anxiety disorder fall into one of two categories: ^{[1] [2]}

• Care-seeking: These individuals frequently interact with the healthcare system, often alternating between doctors and requesting numerous tests and treatments in an effort to obtain second opinions confirming their suspicions.

• Care-avoidant: People with IAD who are care-avoidant tend to steer clear of medical care due to overwhelming fear, believing that seeing a doctor or undergoing tests will uncover a life-threatening illness. This form of health anxiety is less common.

It is important to note that the presence of a real medical condition does not rule out a diagnosis of illness anxiety disorder, and it is possible for both a bodily ailment and IAD to co-occur. When a physical diagnosis exists, illness anxiety disorder is confirmed only if the health-related preoccupations are disproportionate to the medical condition. ^[1]

Somepeople with illness anxiety disorder experience a temporary form of the condition, which is linked with a lower risk of co-occurring mental health disorders, higher medical comorbidity, and less severe IAD. Fortunately, with the right psychiatric care (therapy, medication, or a combination of both), people with health anxiety can manage their symptoms. ^[2]

Is it the Same as Hypochondria?

Illness anxiety disorder was formerly known as hypochondriasis (or informally as hypochondria), a term that was revised in the Diagnostic and Statistical Manual, Fifth Edition (DSM-5) due to its negative connotations. In the newest edition of the manual, hypochondriasis was replaced by two new disorders: somatic symptom disorder (SSD) and illness anxiety disorder. ^{[1] [3]}

Both fall into the “Somatic Symptom and Related Disorders” category of the manual, with health anxiety listed separately from somatic symptom disorder, but classified within the same group of conditions. Despite both conditions manifesting as a preoccupation with health and illness, a diagnosis of SSD requires the presence of physical symptoms, whereas IAD does not.

In short, the key difference between illness anxiety disorder and hypochondria involves how the classifications are used in clinical settings today versus in the past. However, even in modern times, the terms “hypochondria,” “hypochondriac,” “hypochondriasis,” and “health anxiety” are more widely recognised by the public than that of illness anxiety disorder. ^[3]

In light of this, we will be using these terms interchangeably in the next section to describe the historical context. This language is no longer used by medical professionals. Please note that although this terminology may be considered outdated or potentially insensitive, it is used here for clarity and accessibility only.

How Common Is It?

Illness anxiety disorder is fairly common, with the DSM-5 claiming a global prevalence of 3% and other studies indicating a presence of anywhere between 0.1 and 13% in the general population. In terms of individuals with co-occurring medical conditions, the prevalence ranges from 5 to 30%. ^{[1] [4]}

That being said, health anxiety is a relatively recent diagnosis, with the DSM-5 classification of hypochondriasis changing in 2013 to no longer include the criteria for what is now known as somatic symptom disorder. In light of this, the prevalence of illness anxiety disorder is not well established, with estimates based on the prevalence of hypochondriasis. ^[1]

Among individuals previously diagnosed with hypochondriasis, approximately 25% meet the criteria for health anxiety. Recent research has revealed that IAD is common among adolescents, with no significant gender differences, and may worsen with age. It is also more prevalent in individuals who are unemployed or have lower levels of education. ^[1]

Often called "Medical Student's Disease," illness anxiety disorder is common among those in health-related fields, such as medical professionals, nurses, and pharmacists. Furthermore, health science students often develop transient IAD symptoms as they learn about diseases, leading them to overthink bodily sensations and misinterpret them as serious conditions. ^[5]

Symptoms

People with IAD do not usually present with significant physical symptoms, but struggle with intense anxiety regarding their health, nevertheless. While the specific illness causing disordered fear may vary over time, the anxiety surrounding serious illness remains. IAD presents as both care-seeking and care-avoidant subtypes, with the following symptoms: ^[2]

• Preoccupation with having or contracting a serious health condition (especially if there is a family history of the illness)
• Experiencing overwhelming distress about the possibility of being ill, to the point where it becomes challenging to function at work, school, or to remain present in relationships
• Reacting to normal bodily sensations (such as stomach noises) or minor symptoms (like a mild rash) with excessive concern
• Sensitive to topics of illness and becomes easily concerned about health status, whether in regard to themselves or others
• Steering clear of certain people, places, or activities due to perceived health risks (such as visiting an ill family member)
• Frequently discussing one’s health and potential illnesses with others
• Constantly examining the body for signs of illness or disease
• Continuously researching information about medical conditions, symptoms, and medication side effects
• Gaining little to no comfort from medical consultations or normal test results
• Relentlessly seeking medical consultations for reassurance, diagnoses, and second opinions, even when unwarranted (or avoiding doctors altogether due to fear of receiving a serious diagnosis)

Causes

The exact cause of illness anxiety disorder is not fully understood, though several risk factors are believed to contribute to its development. These include environmental or developmental influences, behavioral contributors, and psychological factors: ^{[1] [4] [5] [6]}

Environmental and Developmental Influences

• Growing up in an environment where health anxieties were a common topic, or with parents who were excessively concerned about health, may increase the risk of developing IAD.
• A history of serious illness during childhood, or having a parent or sibling with a major medical condition, may increase the likelihood of health anxiety (particularly when accompanied by strong negative emotions).
• Significant life stress may occur before the onset of symptoms, while a history of childhood abuse or serious illness could increase the risk of developing symptoms in adulthood.

Behavioral Contributors

• Spending excessive time researching health-related topics online may increase the risk of developing illness anxiety disorder.
• Some studies have found that smoking is significantly linked to health anxiety.

Psychological Factors

• Individuals with pre-existing anxiety disorders, such as generalized anxiety disorder or social anxiety, are at a higher risk of developing IAD.
• Factors such as personality traits and mood characteristics (like neuroticism) and an inability to cope with emotional and physical stress are also significant in the development of health anxiety.
• People with IAD may experience normal bodily processes with abnormally heightened sensations, interpreting subtle changes as signs of serious illness

Related Conditions

Several mental health conditions exhibit symptoms that overlap with those of IAD. Differentiating it from these related conditions is essential for accurate diagnosis and treatment: ^{[1] [2]}

Underlying Medical Conditions: Conditions such as brain or hormone disorders, hidden cancers, and diseases affecting multiple body systems can mimic health anxiety. However, if a medical condition is present, the health anxiety in IAD is disproportionate to the seriousness of the illness, and transient preoccupations do not qualify for a diagnosis of IAD. ^[2]

Adjustment Disorder: In cases where an individual has a severe illness, anxiety is a normal response and not a mental health condition. However, when this anxiety causes significant distress or impairment, an adjustment disorder (difficulty coping with a significant life event) may be diagnosed. That said, if health anxiety persists beyond six months, IAD may be diagnosed. ^[2]

Somatic Symptom Disorder (SSD): Somatic symptom disorder is characterized by multiple persistent somatic (physical) symptoms and excessive worry about these symptoms. However, patients with illness anxiety typically experience minimal bodily symptoms, and the criteria are centred around a belief that one is ill without evidence. ^[1]

Obsessive-Compulsive Disorder (OCD): OCD involves intrusive thoughts and compulsive behaviors, such as repetitive actions like checking behaviors. While people with IAD may also engage in compulsive behaviors such as body checking or reassurance seeking, their concerns are primarily focused on health, unlike the broader range of issues seen in OCD. ^[1]

Body Dysmorphic Disorder (BDD): BDD is characterized by a preoccupation with perceived defects in appearance, leading to behaviors like mirror checking that may mirror health anxiety. However, unlike IAD, which is centered on health concerns, BDD patients are fixated on the false belief that they are unattractive rather than ill. ^[1]

Generalized Anxiety Disorder (GAD): GAD involves excessive concern surrounding aspects of daily life, such as social, romantic, and occupational concerns, although these may include health to a lesser degree. In contrast, individuals with health anxiety are excessively and solely anxious about their health, which distinguishes them from those with GAD. ^[1]

Panic Disorder: While panic attacks experienced in those with panic disorder can indicate the existence of a medical condition, the health-related anxiety is episodic. In contrast, individuals with IAD have more enduring and persistent health fears, though panic attacks may occur as a result of illness concerns in those with IAD. ^[2]

Major Depressive Disorder (MDD): During depressive episodes, individuals may ruminate on health and worry excessively about illness. Illness anxiety disorder is not diagnosed if these concerns are exclusive to a depressive episode. However, if health anxiety persists after the remission of depression, IAD may be considered. ^[2]

Psychotic Disorders: Unlike the delusions (false beliefs) seen in psychotic disorders, individuals with health anxiety are not delusional and can recognize that their health concerns may not be grounded in reality. The anxiety in IAD is plausible, while psychotic delusions surrounding the body are more bizarre and unrealistic (for example, that an organ is “dead”). ^[2]

Risks and Complications

Beyond the emotional distress experienced by people with IAD, individuals with health anxiety often struggle with increased healthcare costs, relationship difficulties, challenges with daily functioning, and an increased risk of developing other health disorders (physical and mental), as well as a risk of self-medicating with prescription drugs or substances. ^{[1] [5]}

• Financial hardship: Individuals with health anxiety who frequently seek medical attention often incur significantly higher medical expenses than the average person and may experience financial difficulties.
• Strain on personal relationships: Excessive and unnecessary worry about health can be frustrating for family and friends, potentially leading to relationship difficulties.
• Difficulties in daily functioning: Persistent health anxiety can interfere with the ability to carry out daily responsibilities, with severe cases potentially leading to disability.
• Work-related dysfunction: Frequent fears of illness can result in excessive absences from work and decreased job performance, potentially causing problems in one's career.
• Increased risk of other mental health conditions: Individuals with IAD have a higher likelihood of developing other psychiatric illnesses, such as major depression, other anxiety disorders, or other mental health conditions.
• Potential for physical symptoms: The stress and anxiety related to health worries can manifest as real physical symptoms, even if they do not correspond to the feared illness.
• Risk of substance use: In some instances, individuals with health anxiety may attempt to self-medicate with drugs or alcohol, which can lead to addiction in severe cases.

Diagnosis

Illness anxiety disorder is considered a diagnosis of exclusion, meaning that it can only be diagnosed when other health conditions are ruled out. A thorough medical evaluation and appropriate tests based on the individual's perceived symptoms should be performed to exclude actual diseases before diagnosing a patient with IAD. ^[1]

The DSM-5 has also outlined the following diagnostic criteria to assist in the identification of health anxiety: ^{[1] [2]}

• Persistent and unreasonable concern with having or contracting a serious or life-threatening health condition
• Physical (somatic) symptoms are not present or are only mildly distressing. If an illness does exist, or there is a high risk of developing one (such as due to family history), the health-related anxiety is disproportionate
• Heightened anxiety and excessive concern regarding health issues or potential illnesses
• The individual engages in excessive and repetitive health-related behaviors, such as frequently checking the body for signs of illness
• Symptoms have been ongoing for a minimum of 6 months
• The preoccupation with illness is not better accounted for by another mental health condition

The manual recognizes two distinct subtypes: ^{[1] [2]}

• Care-seeking: Frequent use of medical services, including numerous physician visits, tests, and procedures
• Care-avoidant: Avoidance or rare use of medical care

An interviewer-administered tool titled "The Health Preoccupation Diagnostic Interview" will potentially be utilized by a healthcare provider to confirm the diagnosis of health anxiety. This assessment helps clarify the responses of individuals who may be struggling with illness anxiety disorder, and assists in distinguishing IAD from somatic symptom disorder and healthy individuals. ^[1]

Difficulty in Seeing the Signs of Illness Anxiety Disorder

Recognizing health anxiety can be challenging, particularly in primary care settings where people with the disorder often first seek help. These individuals frequently present with intense fears about having a serious medical illness, prompting general practitioners to respond with appropriate concern by ordering relevant tests and investigations to rule out physical causes. ^[1]

Due to the fact that diagnostic tests often return non-alarming results, and repeated reassurance fails to alleviate concern, the severity of the individual’s preoccupation may be mistaken for genuine medical uncertainty rather than a mental health condition. Furthermore, the absence of obvious psychiatric symptoms can delay referral to mental health services. ^[1]

Additionally, although illness anxiety seems to occur at similar rates in different countries, currently, not much is known about how it may show up differently across cultures. That said, the DSM-5 states that doctors should be careful when diagnosing IAD in people with cultural beliefs surrounding illness (e.g., that frequent headaches are early signs of a serious disease). ^[2]

It’s imperative for providers to understand an individual’s cultural beliefs before diagnosing. Culture can shape how someone interprets bodily sensations, expresses distress, and their attitude about seeking help. Providers don’t want to risk mislabeling something culturally normative as pathological.

To further complicate the matter, it can be difficult to pinpoint exactly which mental health disorder a person has, particularly if the individual is struggling with more than one. Health providers need to consider the presence of co-occurring or separate psychiatric disorders, which may be affecting a person’s ability to function and present with similar symptoms to IAD.

Treatment Approaches

Illness anxiety is difficult to treat and can strain the healthcare system due to an increase in unnecessary tests or scans. However, once the mental health condition has been identified, effective treatment (in the form of therapy and medication) requires regular follow-up appointments with a primary care physicianand a qualified mental health professional, like a psychiatrist and a psychologist. ^{[1] [4]}

These consistent check-ins can help prevent unnecessary visits to emergency departments or other medical specialists. Ongoing appointments also allow for the monitoring of positive or negative changes in symptoms, and provide education for people with IAD regarding any concerns they may have with their health status. ^[1]

Therapy

Psychotherapy is the primary treatment for illness anxiety disorder, and may take three months or longer to show improvements in outpatient settings, but the benefits typically last for up to five years. Cognitive-behavioral therapy (CBT) has been found to be the most effective form of therapy for health anxiety, and includes a variety of subtypes. ^{[1] [4]}

Cognitive-Behavioral Therapy (CBT)

Cognitive-behavioral therapy is the first-line treatment for illness anxiety disorder, and consists of multiple subtypes that have been shown to be equally effective. CBT is a form of therapy that aims to address dysfunctional and maladaptive thought patterns by teaching individuals to recognize and challenge unhealthy thoughts using various techniques. ^{[1] [4]}

CBT may help to address an individual’s compulsion to constantly check their body for signs of illness. Cognitive-behavioral therapy may also involve educating the individual about normal bodily sensations that need not cause concern. It is useful to be aware that online CBT is an effective supplement or alternative to traditional in-person therapy. ^{[1] [4]}

CBT Subtypes for Health Anxiety

Several approaches within the cognitive-behavioral therapy modality have shown effectiveness in treating hypochondriasis. Each subtype offers unique strategies to help individuals manage excessive health-related fears and behaviors: ^{[1] [4]}

• Cognitive Therapy (CT): CT focuses on identifying and challenging irrational thoughts related to illness and health (for example, thinking that stomach gurgling indicates the presence of colon cancer). By reframing and reasoning with these distorted beliefs, individuals can reduce their distress and develop more stable thought processes.

• Exposure and Response Prevention (ERP): ERP gradually exposes individuals to their health-related fears (e.g., receiving a vitamin B12 injection after they have researched and developed a fear of the potential risks). Over time, this form of therapy reduces sensitivity to triggers and breaks the cycle of excessive anxiety.

• Group CBT (G-CBT): Group CBT offers a supportive sharing environment where individuals can relate to and learn from others facing similar challenges. These sessions are led by qualified psychologists to encourage peer support and group learning, which can reduce feelings of isolation or shame, and inspire hope and motivation.

• Mindfulness-Based CBT (MB-CBT): MB-CBT combines traditional CBT with mindfulness techniques (such as deep breathing and meditation) to help individuals cope with health-related distress without acting on it. This form of CBT can increase self-awareness and empower people with IAD with tools for emotional regulation.

• Acceptance and Commitment Therapy (ACT): ACT encourages patients to accept the presence of anxious health-related thoughts instead of resisting them, while focusing on values-based actions such as being of service. This form of therapy helps people with health anxiety live a meaningful life without being controlled by a fear of illness.

Medication

Medication is considered a second-line treatment for health anxiety, as many people with IAD are more comfortable with therapy than pharmaceuticals, due to the fact that medications can sometimes increase anxiety and distract individuals from the benefits of therapy. ^{[1] [4]}

That said, antidepressants such as selective serotonin reuptake inhibitors (SSRIs) and serotonin-norepinephrine reuptake inhibitors (SNRIs) have shown effectiveness in managing symptoms. Some older medications, like clomipramine, may also help in certain cases. ^{[1] [4]}

However, in the majority of cases, a combination of pharmaceuticals and therapy provides the best results. For those who benefit from these medications, ongoing adherence is typically recommended for a duration of 6 to 12 months. ^[1]

Living with Illness Anxiety Disorder

Fears surrounding illness in people with untreated illness anxiety disorder can become so overwhelming that they begin to define an individual’s identity. Health concerns may dominate conversations, and even minor life stressors can intensify the distress. This constant anxiety can be difficult for others to understand, often putting strain on friendships, family, and work relationships.

Furthermore, the slightest bodily response (such as fatigue) can cause intense and irrational anxiety. This can drive those living with undiagnosed IAD to spend excessive amounts of money in pursuit of a diagnosis that confirms their fears, putting them at risk of financial hardship and debt.

Fortunately, research shows that with cognitive-behavioral therapy, medication, or a combination of both, the outlook for people with health anxiety is generally considered to range from fair to good. Additionally, it has been found that people who are hopeful, willing, and tolerant who seek psychiatric care experience more positive results. ^[1]

Final Thoughts

Illness anxiety disorder (IAD), previously known as hypochondria and sometimes referred to ashealth anxiety among laypeople, is a condition marked by excessive and persistent worry about health. People with IAD may frequently pursue medical consultations with multiple doctors and repeatedly request changes in their treatment (care-seeking type), or they may steer clear of medical care out of fear (care-avoidant type).

No matter which form of health anxiety a person has, the disorder can significantly impact their life (and the lives of those around them) despite the absence of significant physical symptoms. Illness anxiety disorder can lead to strained relationships, difficulties fulfilling responsibilities at work, and impaired daily functioning.

Fortunately, by recognizing the symptoms, obtaining a diagnosis, and seeking treatment in the form of therapy (and sometimes medication), there is hope for managing the symptoms of IAD and improving overall well-being. With the right psychiatric team, individuals with health anxiety have the opportunity to improve their symptoms and live a fulfilling life.

Author

Star Gorven

Star Gorven is a wellness and mental health writer with a talent for crafting evocative and evidence-based content across a wide range of topics. Her work blends analytical research with imagination and personality, offering thoughtful insights drawn from her exploration of subjects such as psychology, philosophy, spirituality, and holistic wellbeing.

Activity History - Last updated: March 19, 2026, Published date: March 19, 2026

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Reviewer

Geralyn DexterPhD, LMHC

Geralyn Dexter, PhD, LMHC (she/her), is a psychology faculty member, researcher, writer, and licensed therapist with 15 years of experience providing evidence-based care.

Activity History - Medically reviewed on March 28, 2026 and last checked on March 19, 2026