Recurrent Depressive Disorder

Key facts

• Recurrent depressive disorder means two or more distinct episodes of depression, each lasting weeks to months, with periods of relatively normal mood in between.
• During an episode the core features are persistent low mood, marked loss of interest or pleasure, and a drop in energy; sleep, appetite and concentration usually shift too.
• Treatment aims both to lift the current episode and to reduce future ones; psychological therapy is a cornerstone, and for severe or frequent episodes mood-stabilising agents such as lithium are added within broader mental health care.
• Any thought of self-harm is a reason to seek urgent help.

Understanding the episode cycle

The most consistent features of an episode are persistent low mood, loss of interest or pleasure in things that once felt rewarding, and low energy that makes simple tasks feel effortful. Sleep and appetite often change noticeably, concentration becomes difficult, and some people experience a heaviness of movement or thought that others can observe. Episodes can be triggered by stress, loss or illness, but many occur with no clear cause. Between episodes, mood returns to the person's normal baseline, which sets this condition apart from persistent depressive states.

Long-term management

Because episodes tend to recur, treatment works on two fronts: lifting the current low mood and lowering the chance of the next episode. Psychological therapy, particularly cognitive behavioural approaches, is central to longer-term care. Medication sits within the broader mental health landscape; for some people with severe or frequent episodes, mood-stabilising agents such as lithium are used alongside other medicines to help prevent relapse.

When to seek help

Contact a doctor or a mental health helpline if low mood persists for more than two weeks, and seek urgent help for any thoughts of self-harm or suicide.

This page is educational and does not replace advice from a doctor or pharmacist who knows your health history.