Classification & Assessment in Psychiatry · Paper A
Adjustment disorder
Adjustment disorder is an unhelpful, distressing reaction to an identifiable life stressor that goes beyond an ordinary, proportionate response, but is not severe enough to be another specific disorder. For example, imagine someone who becomes preoccupied and struggles to function for weeks after a divorce, without meeting full criteria for depression. In practice, this means diagnosing adjustment disorder only once you have actively ruled out a more specific diagnosis.
In ICD-11 it is defined by a PREOCCUPATION with the stressor or its consequences and a FAILURE TO ADAPT, causing real distress or impaired functioning. Symptoms begin in close relation to the stressor. If the picture instead meets the criteria for another disorder, a full depressive episode, or PTSDPost-traumatic stress disorder, a condition triggered by experiencing or witnessing a traumatic event.Read more → (post-traumatic stress disorder), you diagnose that more specific disorder instead. The stressor need not be as extreme as the trauma required for PTSD. Picture a patient distressed and preoccupied after redundancy, but who also has 6 of the 10 depressive symptoms for two weeks. Practically, diagnosing a depressive episode instead, since it is more specific and fully met.
A fresh doctor might wonder why psychiatry needs a separate label for "struggling after something bad happened" when depression and anxiety disorders already exist. Adjustment disorder fills a specific gap: it captures distress that is clearly tied to an identifiable stressor, is out of proportion or disabling, but does not fully meet the criteria for a more specific disorder like a major depressive episode. Hold the phrase IDENTIFIABLE STRESSOR through every section below; it is the anchor the whole diagnosis is built on.
Adjustment disorder is a maladaptive emotional or behavioural response to an identifiable psychosocial stressor, for example a relationship breakdown, job loss, or a new diagnosis of physical illness, where the reaction is disproportionate to what would normally be expected, or causes significant impairment in daily functioning, but does not meet full criteria for another named disorder such as depression, an anxiety disorder, or (post-traumatic stress disorder).
A common mistake is diagnosing adjustment disorder simply because a patient is distressed after a difficult life event. The diagnosis specifically requires that the presentation does NOT better fit another disorder. If a patient meets full criteria for a major depressive episode after a bereavement, the correct diagnosis is depression, not adjustment disorder, even though the stressor is obvious. Adjustment disorder is, in effect, a diagnosis of exclusion once a clear stressor is established.
Imagine a patient who loses their job and, within a couple of weeks, develops low mood, poor sleep, and difficulty concentrating that interferes with looking for new work, but does not reach the severity or symptom count of a major depressive episode. This is the shape adjustment disorder is designed to capture. Both major classification systems require the symptoms to begin within a defined window after the stressor: ICD-11 (the World Health Organization's International Classification of Diseases, 11th revision) sets this at around one month, while DSM-5 (the American Psychiatric Association's Diagnostic and Statistical Manual, 5th edition) allows up to three months. Exam questions frequently test which system's timeframe is being referenced, so noting which manual is named in a vignette matters.
Across both systems, the shared skeleton is: an identifiable stressor precedes the onset; symptoms develop within the system's defined onset window; the reaction is disproportionate to the stressor or causes clinically significant impairment in social, occupational, or other functioning; the presentation does not meet criteria for another specific mental disorder; and the disturbance is not simply an expected, culturally normal response to bereavement or a similar event. Symptoms can present as depressive, anxious, or a mix of both, and can include behavioural change such as social withdrawal.
Adjustment disorder must be distinguished from and acute stress reaction, both of which require a specific type of stressor (an event involving actual or threatened death, serious injury, or sexual violence) and a characteristic symptom cluster including intrusive re-experiencing and avoidance. A normal grief reaction, without disproportionate impairment, is not a disorder at all. A major depressive episode, once its own criteria (threshold symptom count, duration, and severity) are met, takes diagnostic priority over adjustment disorder even when a clear stressor is present. If low mood or anxiety persists well past the stressor's resolution, or intensifies rather than settles, the diagnosis should also be reconsidered, since it may in fact represent a prolonged grief disorder (a category newly recognised in ICD-11 and DSM-5's later text revision) rather than a straightforward adjustment reaction.
Diagnosis is made clinically, by taking a careful history that establishes, in order, the identifiable stressor, the timing of symptom onset relative to that stressor, the specific symptoms and their severity, and the degree of functional impairment. The clinician then actively checks the symptoms against the criteria for depression, an anxiety disorder, and , since adjustment disorder can only be diagnosed once those alternatives have been reasonably excluded. Expected COURSE is part of the diagnostic picture too: once the stressor and its consequences have ended, symptoms should not persist beyond a further period, generally described as up to around six months, unless a prolonged grief-type presentation applies: a presentation that fails to resolve on this expected timescale should prompt a fresh look at whether another disorder has in fact developed.
Management is typically conservative and time-limited, since the disorder is expected to resolve once the stressor and adjustment process complete. NICE and Maudsley-informed practice favour psychological support first-line: brief supportive counselling, problem-solving therapy, or (cognitive behavioural therapy) where impairment is significant, with medication generally avoided unless symptoms are severe or a comorbid disorder such as depression is confirmed. Safety assessment, including risk of self-harm, remains essential regardless of the label, since distress severity, not the diagnostic category alone, determines urgency.
Vignettes often describe a stressor plus low mood and expect the candidate to weigh whether full depression criteria are met before defaulting to adjustment disorder. Another trap changes the classification system referenced mid-question, for example naming a symptom onset of ten weeks and asking which system it would qualify under, since three months fits DSM-5's window but may fall outside ICD-11's roughly one-month window depending on exact wording.
Adjustment disorder requires an identifiable stressor, symptom onset within a defined window after that stressor (about one month under ICD-11, up to three months under DSM-5), disproportionate distress or functional impairment, and exclusion of a better-fitting diagnosis such as depression or ; it is expected to resolve once the stressor and its consequences end, usually within around six months, and first-line management is psychological support rather than medication.