Ep 217 – Illness anxiety disorder

In this episode, Dr Roger Henderson discusses illness anxiety disorder (IAD), a condition that presents unique challenges for both patients and healthcare professionals. Formerly known as hypochondriasis, IAD is characterised by a persistent fear of having or developing a serious medical illness despite appropriate evaluation and reassurance. These patients often present in primary care and specialist settings, frequently seeking answers for symptoms that may be minimal or entirely absent. Recognising the condition is important, as repeated investigations alone rarely alleviate distress and can contribute to unnecessary healthcare utilisation. This episode explores the clinical features, risk factors, diagnostic criteria, differential diagnosis and evidence-based management of IAD. It also discusses practical strategies for building therapeutic relationships and supporting these patients in a compassionate and effective manner.

Key take-home points

• IAD, formerly known as hypochondriasis, is characterised by a persistent fear of having or developing a serious illness despite little or no objective medical evidence of disease.
• Patients often misinterpret normal bodily sensations as signs of severe pathology. This heightened vigilance can reinforce anxiety and perpetuate a cycle of reassurance-seeking.
• The condition was introduced in the fifth edition of the Diagnostic and Statistical Manual of Mental Disorders, replacing many cases previously diagnosed as hypochondriasis.
• IAD is primarily a disorder of health-related beliefs and interpretations rather than a disorder driven by significant physical symptoms.
• A history of serious childhood illness, exposure to illness in family members or growing up in a health-anxious environment may increase risk. Underlying anxiety disorders are also common predisposing factors.
• Patients may repeatedly seek medical consultations and investigations despite normal findings.
• Not all patients are care-seeking. Some avoid healthcare altogether because they fear receiving a diagnosis of a life-threatening condition.
• The diagnosis should only be made after an appropriate medical assessment has ruled out relevant organic disease.
• The presence of a genuine medical condition does not exclude IAD. The diagnosis can be made when health-related fears are clearly excessive or disproportionate to the actual illness.
• Repeated reassurance often provides only temporary relief. Anxiety typically returns, leading patients to seek further consultations or investigations.
• IAD can significantly impair social, occupational and interpersonal functioning.
• Differentiating IAD from somatic symptom disorder is important. In IAD, the fear of illness is the primary problem, whereas in somatic symptom disorder, distressing physical symptoms are central.
• Establishing a therapeutic alliance is one of the most important aspects of management. Patients benefit when their distress is acknowledged without reinforcing illness-related fears.
• Cognitive behavioural therapy is considered the first-line treatment. It helps patients challenge maladaptive health beliefs and reduce excessive body-checking and reassurance-seeking behaviours.
• Early recognition and appropriate psychiatric intervention are associated with better outcomes. Untreated illness anxiety can lead to chronic disability, unnecessary healthcare utilisation and increased risk of comorbid mental health conditions.

Key references

1. Newby JM, et al. J Psychosom Res. 2017;101:31-37. doi: 10.1016/j.jpsychores.2017.07.010.
2. Scarella TM, et al. Psychosom Med. 2019;81(5):398-407. doi: 10.1097/PSY.0000000000000691.
3. Bandelow B, Michaelis S. Dialogues Clin Neurosci. 2015;17(3):327-335. doi: 10.31887/DCNS.2015.17.3/bbandelow.
4. Almalki M, et al. Case Rep Psychiatry. 2016;2016:6073598. doi: 10.1155/2016/6073598.
5. Chappell AS. Am J Lifestyle Med. 2018;12(5):365-369. doi: 10.1177/1559827618764649.