Difficulty: Intermediate | Prerequisites: Basic understanding of anxiety disorders and the DSM-5 diagnostic framework.
This section covers disorders where psychological distress shows up as physical symptoms, or where health anxiety dominates a person's life despite medical reassurance. These conditions sit at the intersection of mind and body, and understanding them requires you to think beyond the usual "physical symptom = physical cause" framework. You should already be comfortable with the general idea of how the DSM categorises mental disorders, and a passing familiarity with anxiety disorders will help, since several concepts here (catastrophising, reinforcement, cognitive distortions) overlap directly.
Somatic symptom and related disorders involve either real physical symptoms with disproportionate psychological distress, or fabricated/exaggerated symptoms for psychological reasons. The key challenge is distinguishing these conditions from genuine medical illness. Treatment typically involves cognitive-behavioural approaches that address illness beliefs and reduce reinforcement of sick-role behaviour.
Somatic symptom disorder
One or more distressing physical symptoms (pain, neurological complaints, or symptoms in any body system) accompanied by excessive thoughts, feelings, or behaviours related to those symptoms. The symptoms may or may not have a medical explanation, but the person's reaction to them is disproportionate.
In simple terms, this means the person has real distress about physical symptoms, and that distress takes over their life, even when doctors say they are fine.
Illness anxiety disorder
Preoccupation with having or developing a serious illness, with minimal or no physical symptoms present. The person is consumed by worry about disease rather than by actual bodily complaints.
Think of it as health anxiety turned up to the point where it interferes with daily functioning, even though the person's body is not producing significant symptoms.
Conversion disorder (functional neurological symptom disorder)
Loss of neurological functioning (paralysis, blindness, seizures, mutism, loss of coordination) that cannot be explained by a medical condition. The newer name, functional neurological symptom disorder, avoids assuming psychological causation.
In simple terms, the person's nervous system stops working properly in specific ways, but scans and tests show no physical damage or disease.
Pseudocyesis
False pregnancy, a somatic symptom in which a person exhibits signs of pregnancy (abdominal swelling, missed periods) without actually being pregnant.
Think of it as one of the most dramatic examples of how psychological processes can produce convincing physical changes.
Glove anaesthesia
Loss of all sensation in one hand, ending abruptly at the wrist as if a glove were being worn. Medically implausible because nerve distribution does not follow that pattern.
In simple terms, it is a textbook clue that a neurological symptom has a psychological rather than organic origin.
Primary gain
In Freud's model of conversion disorder, the reduction of anxiety achieved by converting emotional conflict into a physical symptom.
Think of it as the internal psychological payoff: the distressing thought or memory is kept out of awareness.
Secondary gain
External benefits the person receives as a result of having symptoms, such as attention, sympathy, or relief from responsibilities.
In simple terms, other people's reactions (being more caring, excusing the person from obligations) end up reinforcing the symptom.
La belle indifférence
A surprising lack of concern about one's own serious neurological symptoms, historically observed in soldiers with conversion symptoms.
Think of it as the person being oddly calm about what should be a terrifying loss of function.
Factitious disorder (Munchausen's syndrome)
Deliberate fabrication or exaggeration of illness to gain medical attention and occupy the sick role. Unlike malingering, the motivation is psychological (wanting to be a patient) rather than practical (avoiding work, obtaining drugs).
In simple terms, the person fakes being ill because they want the experience of being cared for medically, not because they are chasing a specific external reward.
Malingering
Intentionally faking or exaggerating symptoms to achieve a concrete external goal, such as avoiding military service, obtaining financial compensation, or escaping legal consequences.
Think of it as the practical, goal-directed cousin of factitious disorder. The symptoms are fabricated for a tangible payoff.
Factitious disorder imposed on another
A person (often a caregiver) falsifies illness in someone else, typically a child, to receive attention through the other person's medical care.
The person experiences genuine distress about physical symptoms, whether or not those symptoms have a clear medical explanation.
Health concerns become a core part of identity and dominate interpersonal relationships.
Fear of worsening symptoms leads to avoidance of activities, which can produce isolation and inactivity.
The person may insist on unnecessary medical procedures (e.g. surgery) and catastrophise minor bodily changes.
Fears and complaints tend to focus on a particular organ system.
The primary feature is worry about developing or having a serious illness, not the physical symptoms themselves.
Physical symptoms, if present, are mild or absent entirely.
The person is highly alarmed by any physical sensation and seeks immediate medical care.
"Doctor shopping" is common: moving from physician to physician in search of a diagnosis.
May insist environmental toxins are responsible for their health concerns despite evidence to the contrary.
Prone to periods of anxiety and depression.
Distress may be expressed somatically, or masked through alcohol use or antisocial behaviour.
Health concerns become fused with personal identity.
Changes in emotional wellbeing translate into changes in perceived physical wellbeing.
More common in older adults, possibly because older generations were socialised to express sadness as physical pain.
Young children also commonly express psychological distress through somatic complaints.
Tend to be long-term and disabling, associated with higher rates of disability, low income, impaired sleep, high blood pressure, obesity, high cholesterol, increased hospitalisation, and earlier mortality.
Dysfunctional beliefs about illness: the person assumes serious illness is common and interprets any physical change as a danger sign.
Belief in personal vulnerability to a wide range of diseases, combined with low pain tolerance.
People with somatic symptom disorder experience bodily sensations more intensely, pay more attention to them, and catastrophise them.
This heightened reaction can influence actual physiology (e.g. elevated heart rate), creating a feedback loop that maintains and worsens pain.
The way a patient presents symptoms to physicians and family shapes others' responses: doctors prescribe more, families become more sympathetic, and both reinforce the pattern.
Multiple health complaints and excessive health concern run in families, particularly among female relatives, who also show higher rates of anxiety and depression.
Male relatives of people with excessive health complaints show higher-than-usual rates of alcoholism and antisocial personality disorder.
Genetic transmission of somatic symptom patterns is not clearly established.
Children may model a parent's catastrophising and health-focused behaviour.
Parents who somatise are more likely to neglect their children; children may learn that being ill is the only reliable way to receive care.
The behavioural account frames somatic complaints as the accumulated result of reinforcement for "sickness behaviour" across the person's lifetime.
Somatic symptom disorder and illness anxiety disorder may also appear as part of PTSD, where trauma is expressed through physical symptoms.
Freud's psychoanalytic model: Conversion symptoms result from the transfer of psychic energy attached to repressed emotions or memories into physical form. Symptoms often symbolise the specific concern being repressed. Primary gain is reduced anxiety; secondary gains include attention, sympathy, and relief from obligations.
Behavioural model: Does not infer unconscious anxiety. Emphasises that conversion symptoms remove the person from a difficult environment and let them avoid unwanted responsibilities. Soldiers in wartime frequently developed conversion symptoms (paralysis, blindness) that prevented return to the front, sometimes showing la belle indifférence.
Children with conversion disorder typically mimic the symptoms of someone close to them who is ill.
People with conversion symptoms tend to be highly hypnotisable, supporting the theory that conversion results from a form of self-hypnosis where sensory or motor functions are dissociated from consciousness under extreme stress.
Neuroimaging suggests that anxiety impairs connectivity in sensory or motor brain areas, producing genuine functional impairment.
Usually involves one symptom at a time, though a person can have multiple episodes affecting different body parts.
Unexplained neurological symptoms are common in the general population, but meeting full diagnostic criteria for conversion disorder is rare.
Psychodynamic therapy: Helps the person develop insight into connections between emotions and physical symptoms by recalling triggering events and memories.
Behaviour therapy: Identifies and removes reinforcements for symptoms and health complaints while increasing positive rewards for healthy behaviour.
Cognitive therapy: Teaches the person to interpret physical symptoms accurately and to stop catastrophising, similar to cognitive treatment of panic symptoms.
CBT: Combines identification and challenge of illness beliefs and misinterpretations of physical sensations. Evidence shows positive effects.
Pharmacotherapy: Antidepressants can reduce somatic symptoms.
Culturally adapted approaches: Some clinicians use the person's own belief system and cultural traditions to motivate engagement with therapy.
For conversion disorder specifically:
Psychoanalytic treatment focuses on expressing painful emotions and gaining insight into the link between those emotions and conversion symptoms.
Behavioural treatment targets the anxiety around the original trauma and reduces any benefits the person gets from symptoms (exposure therapy, systematic desensitisation).
Treatment is often difficult because patients do not believe anything is psychologically wrong.
Factitious disorder: deliberate fabrication of symptoms for the psychological reward of occupying the sick role. Evidence of deceptive behaviour distinguishes it from somatic symptom disorder.
Malingering: fabrication of symptoms for a concrete external goal (avoiding a situation, financial gain). The motivation, not the behaviour, is what separates it from factitious disorder.
Factitious disorder imposed on another: a person fabricates illness in someone else (commonly a child or dependent).
The distinction between somatic symptom disorder and genuine medical illness matters in every clinical setting. Emergency departments and primary care offices see patients with medically unexplained symptoms regularly, and misdiagnosis in either direction (dismissing real illness as psychological, or subjecting a psychologically distressed person to unnecessary procedures) carries serious consequences. Conversion disorder was historically common in military settings and remains relevant in understanding how extreme stress can produce real functional impairment without structural damage.
Students often assume somatic symptom disorder means the person is "making it up." It does not. The distress and the symptoms are real to the person; what is disproportionate is the psychological response.
Students frequently confuse illness anxiety disorder with somatic symptom disorder. The key difference is that illness anxiety disorder centres on worry about having a disease, while somatic symptom disorder centres on distressing physical symptoms themselves.
Students sometimes mix up factitious disorder and malingering. The distinction is motivation: factitious disorder is driven by the need to occupy the sick role; malingering is driven by an external, tangible reward.
Students may think conversion disorder is rare and historical. Unexplained neurological symptoms are common; what is rare is meeting the full diagnostic criteria.
⚠️ Be able to distinguish somatic symptom disorder, illness anxiety disorder, conversion disorder, factitious disorder, and malingering from one another. Exam questions frequently present a clinical vignette and ask you to identify which diagnosis fits.
⚠️ Know the difference between primary gain and secondary gain in conversion disorder.
⚠️ Understand the cognitive-behavioural feedback loop: catastrophising leads to physiological arousal, which reinforces the belief that something is medically wrong.
⚠️ Glove anaesthesia is a classic exam example of how neurological anatomy can rule out organic causes.
True or False: Illness anxiety disorder always involves severe physical symptoms.
Fill in the blank: In Freud's model, the internal anxiety reduction from a conversion symptom is called __________.
True or False: Factitious disorder and malingering differ in the person's motivation for faking symptoms, not in the behaviour itself.
Fill in the blank: __________ is a pattern of sensory loss in the hand that does not match nerve distribution and suggests a psychological origin.
True or False: Somatic symptom disorder means the person's symptoms are imaginary.
(Answers: 1. False, 2. primary gain, 3. True, 4. Glove anaesthesia, 5. False)
Q: A patient repeatedly visits different doctors, convinced she has a serious disease, despite normal test results and only mild physical complaints. Which diagnosis best fits?
A: Illness anxiety disorder. The key feature is the preoccupation with having or developing a serious illness, with minimal or no somatic symptoms.
Q: How does the behavioural explanation of conversion disorder differ from the psychoanalytic explanation?
A: The behavioural model does not invoke unconscious anxiety or repressed memories. Instead, it emphasises that conversion symptoms are maintained because they remove the person from stressful situations and provide tangible benefits (avoidance of responsibilities, attention from others).
Q: A person deliberately fakes symptoms of a disease so they can receive medical care and attention. They have no external goal like avoiding work or gaining compensation. What is the diagnosis?
A: Factitious disorder. The motivation is the psychological reward of occupying the sick role, which distinguishes it from malingering.
Q: What role does the cognitive-behavioural feedback loop play in somatic symptom disorder?
A: The person catastrophises normal bodily sensations, which triggers physiological arousal (e.g. increased heart rate). This arousal produces more physical sensations, which the person again interprets as evidence of illness, reinforcing the cycle. Physicians and family members may also reinforce the pattern by prescribing treatments or offering sympathy in response to the person's distress.
Q: Name two treatment approaches for somatic symptom disorder and briefly describe each.
A: Cognitive therapy helps the person interpret physical symptoms accurately and reduce catastrophising. Behaviour therapy identifies reinforcements for sickness behaviour and replaces them with rewards for healthy behaviour. CBT combines both by challenging illness beliefs and misinterpretations of physical sensations.
This material connects directly to anxiety disorders (Chapter 5 in many textbooks), since catastrophising and health-related worry overlap substantially with generalised anxiety and panic disorder. The concept of secondary gain reappears in discussions of operant conditioning and reinforcement schedules in behavioural psychology. Conversion disorder also links to trauma and PTSD, as somatic symptoms can be a primary expression of post-traumatic stress.
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