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Diagnosis and clinical terms

Relapse

Shariq Refai, MD, MBA, board-certified psychiatrist and the reviewer of this article.

Reviewed by Shariq Refai, MD, MBA·Updated March 15, 2026·About 3 minutes

About this term

Quick definition
A return of depressive symptoms after a period of improvement, before full recovery has been achieved.
Full clinical definition
In the consensus framework developed by Frank, Kupfer, and colleagues (Arch Gen Psychiatry, 1991), relapse refers to the return of full depressive symptoms during the continuation phase of treatment, before sustained recovery has been achieved (typically defined as four or more months of remission). A return of symptoms after recovery is called recurrence, and represents a new episode. Both terms are commonly used together in everyday clinical conversation.
Epidemiology
Without continued treatment, the relapse rate within the first six to twelve months after acute response to an antidepressant is roughly 50 percent. With continued antidepressant treatment in the continuation phase, the relapse rate falls by about half (Geddes et al., Lancet, 2003). Lifetime risk of recurrence after one major depressive episode is roughly 50 percent, after two episodes 70 percent, and after three or more episodes greater than 90 percent.
What it can feel like
A return of familiar symptoms (sleep change, low energy, loss of interest, low mood, intrusive negative thoughts, irritability) after weeks or months of feeling close to baseline. Many patients describe a sense of dread when the first signs return, and many also describe a temptation to wait it out rather than reach back to a clinician. Catching a relapse early often makes the next round of treatment shorter and easier.
Why it matters
Relapse is one of the most common reasons treatment ends up longer or more complicated than it needed to be. Stopping antidepressants too soon, missing a return of warning signs, and going to a longer interval between visits than the situation calls for are the most common drivers. Relapse prevention is one of the central goals of long-term depression care.
How clinicians assess it
PHQ-9 tracked at follow-up visits is the most common monitoring tool. A clinician also asks about sleep, appetite, energy, motivation, suicidal thoughts, and substance use. A return to a PHQ-9 score in the moderate or severe range during the continuation phase of treatment is a signal that the plan may need to change.
Treatment implications
Continuation-phase treatment with the same medication that produced remission for at least six months after acute response reduces relapse risk. For people with recurrent depression (two or more prior episodes), maintenance treatment for one to two years or longer is often considered. Maintenance psychotherapy (especially CBT or mindfulness-based cognitive therapy) lowers relapse risk in some studies. A written relapse plan, made when the person is well, helps recognize early signs and shortens the time to acting on them.
Related terms
Remission. Major depressive disorder. Treatment-resistant depression. Medication management.
Related articles
Treatment.

Sources

  • Frank E, Prien RF, Jarrett RB, et al. Conceptualization and rationale for consensus definitions of terms in major depressive disorder: remission, recovery, relapse, and recurrence. Arch Gen Psychiatry. 1991.
  • Geddes JR, et al. Relapse prevention with antidepressant drug treatment in depressive disorders: a systematic review. Lancet. 2003.
  • American Psychiatric Association. Practice Guideline for the Treatment of Patients with Major Depressive Disorder.

Frequently asked questions

What does relapse mean in depression?
Relapse is the return of a depressive episode after a period of improvement but before full recovery is established (usually within the first six months of remission). Recurrence is the term for a new episode after full recovery. Both are common and are tracked in treatment planning.
How common is relapse and recurrence?
After a first episode of major depressive disorder, the lifetime risk of recurrence is about 50 percent. After two episodes the risk rises to about 70 percent, and after three episodes to about 90 percent (APA Practice Guideline). This is why ongoing care matters even after recovery.
What are the early warning signs of relapse?
Common early signs include changes in sleep that return, loss of interest in activities that had been enjoyable again, increasing isolation, slipping on basic routines, and the return of guilt or hopelessness thoughts. A written list of personal early signs, shared with a clinician and a trusted person at home, is one of the most useful relapse prevention tools.
How is relapse prevented?
Continuing antidepressants for at least six to twelve months after symptoms resolve, structured maintenance therapy when indicated, mindfulness-based cognitive therapy (MBCT) for patients with three or more prior episodes, sleep regularity, regular movement, and a written relapse plan all have evidence.
What should I do if I think I am relapsing?
Contact your prescriber or therapist promptly. Restarting or adjusting treatment early in a relapse is more effective and faster than waiting for a full episode to develop. If suicidal thoughts return with intent or a plan, call or text 988, call 911, or go to the nearest emergency department.

Last reviewed March 15, 2026.

Every clinical page on DepressionResource.org is written in plain language, dated, and reviewed by a board-certified psychiatrist against current clinical guidelines. See our editorial standards and medical review process.