Cyclothymia: A Care Staff Guide to Mild Bipolar Mood Swings

Cyclothymia is a mood condition that sits on the bipolar spectrum but is milder, which is exactly why it is so often missed. A person may be described as moody, unreliable or "up and down" for years before anyone considers a diagnosis. This guide, based on NHS information last reviewed in October 2023, explains what cyclothymia is, how it differs from bipolar disorder, what treatment is available and how care staff can help people get the right support. It should be read with our guide to bipolar disorder for care staff.

What is cyclothymia?

The NHS describes cyclothymia as a mild form of bipolar disorder in which mood shifts between low periods and emotional highs. Because the symptoms are often mild, it frequently goes undiagnosed. The symptoms are too mild for a full bipolar diagnosis, but they are still real and can interfere with relationships, work and daily life.

Symptoms

According to the NHS, people with cyclothymia have periods of low mood that are not severe enough to count as depression, alternating with periods of hypomania. Hypomania can involve high energy, needing less sleep, being very sociable and acting impulsively. Between these episodes, people can have periods of normal mood.

The NHS says the mood changes happen at least every two months. A diagnosis is usually made after two years, or after one year in children and teenagers, because a pattern needs to be seen over time.

How it relates to bipolar disorder

The NHS explains that cyclothymia carries a risk of developing full bipolar disorder. For some people the episodes become more severe, while for others the condition is lifelong without changing. This is one reason the NHS advises seeking help early, before it progresses. If you notice a person's highs becoming more extreme, for example little need for sleep over several days, very risky behaviour or losing touch with reality, tell a clinician promptly.

Treatment

The NHS says treatment may include talking therapy, such as CBT, and medicines. Medicines used can include mood stabilisers such as lithium, some epilepsy medicines and some antipsychotics, for example quetiapine. Not everyone needs or responds to medicine, so the choice is made between the person and their clinician. If someone you support takes lithium, our guide to lithium monitoring and safety for care staff explains the monitoring that is needed.

Why it is easy to miss in care settings

Cyclothymia can be mistaken for personality, temperament or "difficult behaviour". A person may be described as erratic or unpredictable, or as someone who is bubbly one week and withdrawn the next. Staff can help by recording what they observe in factual terms, such as sleep, energy, mood and activity, rather than using labels. A clear record over weeks and months gives a GP or psychiatrist far more to work with than a general impression.

Practical support for care staff

• Record patterns, not just incidents. Note when mood, sleep or energy change and for how long.
• Keep routines steady. Regular sleep and daily structure can help some people to manage mood changes, but this should be agreed with the person.
• Be alert to impulsive decisions. During hypomanic periods, spending, risk-taking or sudden plans can cause harm. Support the person while respecting their capacity and choices.
• Do not dismiss the low periods. Low mood may not meet the threshold for depression, but it can still be distressing.
• Encourage a GP visit. The NHS advises seeing a GP if you think you may have cyclothymia.

Risk and urgent help

The NHS page on cyclothymia does not give urgent help advice, so staff should follow their own organisation's procedures. If a person talks about suicide or self-harm, take it seriously and see our guide to suicide and self-harm awareness for care staff. In an emergency, call 999.

Talking to the person and their family

Many people with cyclothymia have lived for years with the label of being "moody" and may feel misunderstood. Approach conversations with curiosity and without judgement. Ask the person how they experience their own highs and lows, what helps and what makes things harder. With consent, involve family members or close friends, who often notice changes in sleep and energy before anyone else does. A shared understanding that these mood shifts are part of a recognised condition, and not a character flaw, can reduce blame and conflict, and it can make people more willing to seek help from their GP.

Frequently asked questions

Is cyclothymia the same as bipolar disorder?

No. The NHS describes it as a milder form, with symptoms too mild for a full bipolar diagnosis, though it can develop into bipolar disorder.

How long does diagnosis take?

The NHS says diagnosis is usually made after two years of symptoms, or one year in children and teenagers.

Does everyone with cyclothymia need medicine?

No. The NHS notes that not everyone needs or responds to medicine, and talking therapy such as CBT is also an option.

Where can staff build their knowledge?

The health and social care learning available through Learnsignal CPD can help you stay up to date.

This article is general information for care staff, based on NHS information, and does not replace the advice of a person's own clinicians. If you are worried about someone's health right now, contact their GP, NHS 111 or, in an emergency, call 999.