Cyclothymia

Also called Cyclothymic disorder

Cyclothymia is a long-term condition that causes emotional ups and downs, with periods of feeling low and periods of feeling high or full of energy. The mood swings are not as severe as in bipolar disorder, but they can still affect relationships, work and daily life. It often starts in adolescence.

Last updated Nov 9, 2026

What it is

Some people with cyclothymia later develop bipolar disorder.

Talking therapies, learning to recognise mood changes, and sometimes medicines can help.

Common signs

  • Periods of low mood and lack of energy
  • Periods of feeling very happy, energetic or irritable
  • Mood changes that come and go over at least 2 years
  • Rarely having stable mood for long

How it is usually diagnosed

  • Assessment by a GP or mental health professional
  • A mood diary over time

Records worth keeping

Keeping these together makes each appointment easier, especially when you see a new doctor:

  • Mood diaries
  • Assessment and therapy letters
  • Your medicines

Questions to ask your doctor

  • How is this different from bipolar disorder?
  • Would therapy or medicine help me?
  • Which signs should make me seek help sooner?

When to get help right away

Call 112 or go to the nearest emergency department if you have:

  • Thoughts of suicide or self-harm: call 112

This page is general information. It is not a diagnosis and does not replace a doctor who knows your history. Medfold keeps your records organised; it does not interpret them.

Sources