PTSD: What It Is, Signs and Symptoms in Adults, How Long It Lasts

PTSD stands for post-traumatic stress disorder. The label sounds clinical; from the inside it is simple: the event is over, but body and memory keep behaving as though it were still running. A person can know perfectly well that the danger has passed and still flinch at a slammed door, walk around an entire district of the city and wake at four in the morning with a pounding heart. The gap between what you know and what you feel is the most recognisable part of the topic.

One misunderstanding is worth clearing up first. Most people go through hard events. In the WHO World Mental Health surveys across 24 countries (n = 68,894), 70.4% of respondents reported at least one potentially traumatic event, averaging 3.2 events per person — and the disorder develops in a minority. A review of 54 trajectory studies (Galatzer-Levy et al., 2018) found the same shape: resilience was the modal response at an average of 65.7% of people, followed by recovery (20.8%), a chronic course (10.6%) and delayed onset (8.9%). PTSD is not the normal price of having lived through something; it is a distinct course with its own description and its own help.

What PTSD is in plain words

A working explanation: an ordinary memory sits in the past tense and comes with a frame — when, where, how it ended. A traumatic memory can end up without that frame. It is stored as vivid fragments — a sound, a smell, an angle, a sensation in the body — that get triggered by a similar signal in the present and are experienced not as remembering but as happening.

The cognitive model of Ehlers and Clark (2000), one of the most cited in the field, describes persistence exactly this way: PTSD becomes persistent when the event is processed in a way that produces a sense of serious, current threat — through excessively negative appraisals of the event and its aftermath, and through the way the memory itself is held (poorly elaborated and contextualised, with strong perceptual priming). What gets stuck is not the event but its reading and its form of storage.

The signs of PTSD: three clusters

ICD-11 describes the signs and symptoms of PTSD in adults compactly, in three clusters. All three have to be present, and alongside them a visible cost in ordinary life.

Intrusions

Re-experiencing the event in the present tense: flashbacks, intrusive images, nightmares, an abrupt bodily reaction to a reminder. What separates this from simply remembering something bad is not vividness but tense: a memory gets told, an intrusion happens. Dissociation often runs alongside an intrusion — a sense that what is happening is not happening to you, or that you are watching yourself from outside.

Avoidance

A person starts steering around anything that might set off an intrusion: places, routes, people, conversations, films — and their own thoughts and feelings as well. Avoidance works, for minutes. Over a longer stretch it narrows life and keeps the disorder going, because it blocks the experience that would otherwise slowly dismantle the sense of threat.

A sense of current threat

Constant watchfulness, exaggerated startle, difficulty relaxing, broken sleep, irritability. This is hypervigilance — a background that does not switch itself off. Underneath it is the ordinary emergency response, fight, flight, freeze, simply left switched on permanently. It is also what most often brings a person to a doctor first, because it looks like nerves and insomnia.

The meta-analysis of psychophysiological studies (Pole, 2007) records this setting objectively: people with PTSD show a higher heart rate at rest and especially in response to event-related cues, and their startle response habituates more slowly. This is the side behind the phrase that the body keeps the score longer than the memory of the event does. The author is explicit about the limitation — published samples skew heavily towards male veterans.

How this differs from the ordinary reaction of the first weeks

In the first weeks after a hard event almost all adults look as though they have PTSD: sleep breaks up, images return, the body holds tension, reactions to sound are sharp. That is an expected response, not a disorder. This is precisely why the diagnostic frame requires the picture to hold beyond several weeks and to interfere with working, relating and looking after yourself.

From which follows an unpopular conclusion about early help. The Cochrane review (Rose et al., 2002) of single-session psychological debriefing — a method in which a person is asked to recount the event in detail soon after it — found no reduction in distress and no prevention of PTSD; in one trial the risk in the debriefing group was higher at one year (OR 2.88; 95% CI 1.11–7.53). The authors' conclusion was blunt: compulsory debriefing of trauma victims should cease. The practical meaning for a reader is simple: retelling the details does not itself heal, and in the first weeks sleep, safety, the presence of other people and a return to a plain routine are worth far more. More on this in the article on retraumatisation and triggers.

How long PTSD lasts

The honest answer is that it varies, and waiting it out is not a plan. For some people symptoms fade noticeably over the first months; for others they persist for years, and sometimes the picture unfolds only after a delay (in the trajectory review, delayed onset appeared in around 8.9%). In the WHO surveys the mean symptom duration turned out to be considerably longer than had previously been assumed.

What actually shapes the course: whether the dangerous situation is still going on, whether there is support, whether there were repeated events earlier, and whether depression, alcohol or chronic pain have been added on top. The key practical point is that the state responds to work at any distance from the event — ten years later included. A separate thread is post-traumatic growth: some people notice a shift in views and priorities over time, though it does not cancel the disorder and does not replace help.

When the picture is wider: complex PTSD

If the hard part was not a single episode but a prolonged situation that was difficult to escape, something else usually joins the three clusters: emotions run at the edges — flooding or switching off; a stable sense that something is wrong with you as a person; difficulty being close to anyone. In ICD-11 that is a separate diagnosis — complex PTSD. The split is not cosmetic: what predominates — the traumatic core or the disturbances of self-organisation — determines where help starts.

What to do, and when to see a specialist

A sensible threshold is not whether things are bad enough, but two plain markers: more than a month has passed and it is costing you your life — work, sleep, relationships, the ability to leave the house.

What can be done before an appointment and around it:

• Rebuild the supports of a routine. Sleep, food, movement, daylight. This is not generic wellness advice: sleep is a working part of the topic, not background (see below).
• Lower the load from the environment. Fewer news items and materials that pull you back into the theme; more predictable, dull, familiar tasks.
• Do not carry it alone. One person who knows what is going on is enough.
• Look at the picture structurally. The free PCL-5 scale gives a score against the DSM-5 criteria in five minutes — a convenient reference point and good material for a conversation with a doctor. If the question is not the score but which part is burning — the traumatic core or the aftermath of a prolonged environment — that logic is what the complex PTSD test works through: it separates the six ICD-11 clusters and shows the cost in life separately. No questionnaire makes a diagnosis.
• Know what to ask for. Trauma-focused approaches are what clinical guidelines recommend; more in the articles on treatment for PTSD and EMDR therapy. Decisions about medication are made by a doctor.

A separate word about sleep. It does not merely suffer in PTSD, it takes part in the course: the review by Germain (2013) notes that sleep disruption and nightmares may reduce the efficacy of first-line treatment, and in a prospective study of 453 service members (van Liempt et al., 2013) nightmares before deployment predicted PTSD symptoms six months after it (OR 2.99). Sleep is worth treating as a task in its own right rather than expecting it to catch up on its own.

If there are thoughts of death right now, or an urge to hurt yourself, do not put it off: in the United States call or text 988, in the United Kingdom Samaritans on 116 123, and elsewhere your local emergency number. If the danger is ongoing, help starts with safety, not with analysing your state.

When it is not trauma

A similar picture — poor sleep, depletion, irritability, detachment — assembles itself for reasons other than hard events. The usual way of telling them apart is one question: is there a traumatic core — intrusions, avoidance of reminders, and a state tied to specific cues?

• Depression. It also brings depletion, joylessness, broken sleep and thoughts of worthlessness, but without flashbacks and without avoidance of reminders; the dips are not pinned to triggers.
• An anxiety disorder. The anxiety is not tied to what happened and spreads over the future in general: health, money, the people close to you. In PTSD the source is recognisable even when a person is steering around it.
• Long-running exhaustion and burnout. The leading sensation is emptiness and indifference rather than danger, and it recovers with rest, however slowly.
• A borderline pattern. What separates it is the stability of self-image and the fear of abandonment — a topic of its own, CPTSD or BPD.
• ADHD and autism. Here the difficulties reach back into childhood and have no before and after: for such adults there was no point past which things became different.
• The body. A shifted TSH produces palpitations, sweating, an anxious background and insomnia; iron deficiency with low ferritin gives depletion and breathlessness on exertion; a lack of vitamin B12 gives numbness, brain fog and paraesthesia. Sleep apnoea imitates the whole sleep-deprivation picture. Results you already have, the service will help you read.

The boundary is simple: the body and exhaustion explain the background, but they do not explain why one particular sound, smell or date brings the whole state back.

This article is informational and does not diagnose. It does not claim that you have PTSD, nor that you do not: a doctor determines that in person.