PTSD vs Depression vs Adjustment Disorder — Key Takeaways: Criterion A Is Only the Entry Ticket, Global Shutdown, and Worthlessness

📇 The Index Card — Key Takeaways

PTSD vs Depression vs Adjustment Disorder: Differential Diagnosis

The case — Barry, 34, three weeks after a sudden loss. His godfather Joe — a close mentor since childhood — choked on a steak at an Applebee's and died; Barry was not there and heard the next morning by text. Since then: sad most days but better when busy at work, hard to fall asleep three to four nights a week, eating less with no marked weight change, going out less, and picturing the choking briefly — thoughts he can redirect with TV. He avoids Applebee's and watches other people eat a little more closely, but otherwise feels safe. He still plays guitar, watches football, and spends time with his kids; no suicidal thoughts, no prior psychiatric history, PHQ-9 of 9. He needs the right label, because each of the three points to a different plan.

1. Start with Criterion A — and keep the gate narrow. Per DSM-5-TR criteria, PTSD's trauma gate (Criterion A) covers directly experiencing, witnessing, or learning about a violent or accidental death of someone close. Barry clears it: a lifelong mentor, an accidental choking death. Two of NP Z's contrast cases do not clear it on these facts alone — a grandmother dying of heart failure in hospice, even witnessed, is an expected, non-violent death; and hearing that a celebrity died accidentally does not make it a Criterion A event for a fan, because the closeness requirement is missing. So ask both questions every time: how did they die, and how close were you, really — a grandparent not spoken to in 17 years is a different interview from Barry and Joe.
2. Criterion A is the entry ticket, not the diagnosis. PTSD still requires the clusters that follow it — intrusion, avoidance, negative changes in mood and thinking, and hyperarousal (DSM-5-TR criteria B through E). Barry's intrusions are brief and not vivid, and he can redirect them; he reports no pattern of reliving nightmares, no easy startle or hypervigilance, and no broad feeling that the world is unsafe. NP Z's extreme version makes the rule concrete: even a patient who survived kidnapping and torture does not meet PTSD criteria if those clusters are genuinely absent and daily life is intact. Most people exposed to a Criterion A event do not go on to develop PTSD — the horror of the event, on its own, settles nothing.
3. Read the shape of the shutdown: circumscribed vs global. Barry's avoidance stops at one restaurant chain. He still eats at other restaurants, plays guitar, follows football, and engages with his kids — distress that tracks the stressor. The PTSD picture NP Z contrasts is a global, lights-out shutdown: friendships, concerts, crowds, and eating out broadly switched off, trust in people and the world rewritten (“you can't even go out to eat without someone dying”), and in his choking example, avoidance spreading to hard foods themselves. When play, exploration, and connection are broadly offline — not just muted around one reminder — think trauma disorder; when the reaction stays tied to the stressor, think adjustment.
4. Depression's gate is mood or anhedonia — most of the day, most days. Barry is sad most days, but some days are better, work distracts him, and pleasure is still available to him, so the sustained pattern DSM-5-TR requires for a major depressive episode is not there — and a PHQ-9 of 9 (mild symptoms) does not substitute for that pattern. Hold the reverse pearl just as tightly, because it catches missed cases: a patient can look you in the eye, say “I'm not sad,” and still meet criteria for major depression on anhedonia alone (loss of pleasure or interest), if enough of the accompanying symptoms — sleep and appetite change, pervasive guilt, passive wishes not to be here — are present alongside it.
5. Worthlessness is the richest tell — read the quality of the guilt. Barry's guilt is specific and stressor-tied: “I should have gone to that dinner — I know the Heimlich maneuver, maybe I could have saved him.” Depressive guilt, in NP Z's telling, is pervasive self-condemnation that has outgrown the event: “I'm a failure, I can't do anything right, I'm not worthy of being loved — this is just another example.” When the self-attack is global, personal, and present across situations, weight it toward major depression; when regret stays attached to one missed dinner, weight it toward grief and adjustment.
6. Adjustment disorder still has a threshold — and sometimes the answer is grief, not a disorder. An adjustment reaction is distress tied to an identifiable stressor that does not meet another disorder's criteria (per DSM-5-TR) — but it still requires marked distress or real impairment. Barry is going to work and functioning; if his distress is proportionate and his sleep settles, NP Z's caution applies: do not pathologize grief, which has no single timeline, and recognize that sometimes the soundest intervention is support, time, and watchful follow-up rather than a label and a prescription. The label matters precisely because the plans diverge — as the episode frames it, medication treatment is a central tool in major depression in a way it is not for an adjustment reaction, where working on the stressor response and supports comes first.
7. Do not close the file — PTSD can arrive late. A clean screen today is a snapshot, not a lifetime clearance: DSM-5-TR recognizes delayed expression, where full PTSD criteria are met only months after the event. NP Z keeps screening Barry at follow-up — the PCL-5 (the National Center for PTSD's 20-item symptom checklist) and direct questions: how often are you having nightmares of reliving this, and how often do the memories compete for your attention at work? Patients without a reason to exaggerate usually quantify plainly — “once a week,” “a couple of times a day, but I can redirect it” — and that frequency-and-control answer is itself diagnostic data.

The call for Barry: Adjustment disorder on a grief picture — not PTSD, not major depressive disorder. He clears Criterion A, but the B-through-E clusters are missing and his avoidance is circumscribed to one restaurant chain; he lacks the most-of-the-day, most-days mood-or-anhedonia pattern, and his guilt is a specific Heimlich regret, not worthlessness. Support the grief, do not rush to pathologize it, and keep screening with the PCL-5 because delayed-expression PTSD can still emerge. The episode's closing pearl — a qualifying trauma is the entry ticket, not the diagnosis.