AKT · Psychiatry/Personality & other

Medically unexplained symptoms & somatic symptom disorder

Overview

Persistent physical symptoms that are genuinely distressing and disabling but are not explained by identifiable organic disease after appropriate assessment. They are common — a substantial proportion of new outpatient presentations — and the symptoms are real; "unexplained" describes the state of the investigation, not the authenticity of the complaint.

Recognise

Symptoms are genuine and distressing; the patient is not feigning them
Frequently multiple symptoms across several systems, with a long history and many previous negative investigations
Disproportionate thoughts, anxiety and time devoted to the symptoms (the core of DSM somatic symptom disorder)
Often coexisting anxiety, depression or a history of adverse experience
Repeated normal tests give reassurance that is short-lived, and each new test raises the threshold for the next

Red flags

New or changing symptoms, weight loss, night sweats or objective abnormal signs → re-assess properly. A previous label of "unexplained" must never stop you investigating a genuinely new problem.

Differentials & how to tell them apart

Early organic diseaseObjective signs or progressive symptoms — the diagnosis of exclusion must genuinely have excluded things

Depression / anxiety disorderMood or anxiety symptoms dominate and account for the somatic complaints

Functional neurological disorderPOSITIVE signs on examination (Hoover sign, tremor entrainment) — a rule-in diagnosis, not one of exclusion

Health anxietyFear of HAVING a disease predominates over the symptoms themselves

Factitious disorder / malingeringSymptoms are deliberately produced — for the sick role, or for external gain. Rare, and a diagnosis to make cautiously and with evidence

Investigations

Take a full history and examine properly — the assessment must be real, not performative. Investigate proportionately and with a clear rationale, then STOP: repeated low-yield testing is iatrogenic, entrenches illness beliefs and delays effective treatment. Screen for depression and anxiety, which are treatable and common.

Management

One consistent clinician, an explanation that validates the symptoms, and a shift of goal from cure to function

1Assess properly and investigate proportionately. Then give a POSITIVE explanation — name what it is rather than only what it is not, and be explicit that the symptoms are real and that you believe them.
2Consolidate care with one named clinician to reduce fragmentation and duplicated testing. Agree realistic goals framed around function rather than symptom eradication. Treat comorbid depression and anxiety.
3Refer for psychological therapy — CBT has the best evidence — and to a specialist service for persistent physical symptoms where available.Gate: Severe disability, or escalating investigation and admissions → specialist liaison psychiatry input

Antidepressants — Where there is comorbid depression or anxiety, or for specific syndromes such as fibromyalgia or IBS — explain the rationale clearly, or it will be heard as "it's all in your head"

Key points

The commonest failure is the negative explanation: "all your tests are normal, there's nothing wrong". The patient hears disbelief, and seeks another opinion — beginning the cycle again. Say instead that the symptoms are real, that serious disease has been looked for and not found, and that there is a recognised condition with recognised treatment. Then keep investigating genuinely NEW symptoms on their own merits.

Monitor & prognosis

Planned regular reviews at fixed intervals work better than symptom-triggered attendance, which rewards escalation.

Better with early positive diagnosis and continuity of care; worse with repeated investigation, multiple specialist referrals and iatrogenic harm.

Source: NICE CKS — medically unexplained symptoms · Royal College of Psychiatrists