Illness anxiety disorder

Other Names:
Health anxiety
Fear of catastrophic health problems

Illness anxiety disorder is the chronic mental state in which the sufferer is constantly occupied with a delusion that he or she is seriously ill. The individual spends a great deal of time seeking cures, has a gloomy turn of mind and is extremely self-centred. They may also experience physical symptoms of anxiety (eg hyperventilation, trembling, restlessness, lethargy, excessive sweating). He or she is unproductive and drains the resources of family, friends and society by requiring large amounts of the medical profession's time.  As well as placing a burden on the individual, it places a burden on society due to excessive health care use.  There is also little community awareness it exists. And it is often misdiagnosed as a “personality trait” rather than a treatable condition.


Illness anxiety disorder involves an overwhelming, disabling and crippling fear of illness and is a psychiatric disorder listed in the Diagnostic and Statistical Manual of Mental Disorders, known as DSM-5. Illness anxiety disorder replaced the contentious diagnosis of hypochondriasis in previous versions of the DSM. The new label, which is also sometimes referred to as severe health anxiety or health anxiety for short, is less stigmatising and better reflects the fact anxiety about illness is at the heart of this condition.

The illnesses people fear are vast and varied. While the creative ways the mind interprets what is going on the body can be fascinating, it’s also troubling how debilitating this condition can be.  Some people are terrified of having cancer, heart defects, HIV or other STIs, despite repeated reassurance and negative test results. Others are anxious they have neurological conditions and dementia despite all evidence pointing to the contrary. Some are convinced they have parasites, mental illnesses and even Ebola.

As a form of anxiety, one of the hallmarks of the condition is obsessive worry or fear. It will manifest in the following actions:

  • Constant or persistent research about your medical symptoms
  • Doctor hopping
  • Desire to obtain multiple doctors’ opinions
  • Social isolation or withdrawal
  • Need to get your affairs in order
  • Reckless behaviour such as substance abuse or needless spending as a way to cope with the worry
  • Demand for repetitive medical tests
  • Heavy monitoring of vital signs and medical results
  • Extreme dieting or exercise



Data from an Australian population survey, published in 2013, found illness anxiety affects 5.7% of Australians at some point in their lives. That’s over one million people. 

Illness anxiety disorder affects both men and women equally, but the following may also be prone to the condition than the general population:

  • Individuals who are already diagnosed with a general anxiety disorder or post-traumatic stress disorder (PTSD)
  • Those who are showing symptoms of anxiety disorders
  • People who are going through significant life events
  • Older adults or seniors
  • Those who like to search for their symptoms online
  • People who struggle with sleep
  • Individuals diagnosed with a pre-existing medical condition such as hypothyroidism
Related UN Sustainable Development Goals:
GOAL 3: Good Health and Well-beingGOAL 13: Climate Action
Problem Type:
E: Emanations of other problems
Date of last update
04.07.2021 – 12:29 CEST