Mood, irritability and anxiety in treatment-induced menopause

Many women notice changes in mood when breast cancer treatment brings on menopause or lowers oestrogen. Oestrogen affects brain chemicals involved in mood, sleep and stress responses, so a sudden drop can lead to irritability, tearfulness, anxiety, low mood, feeling flat or overwhelmed, and mood swings that seem out of proportion to events. At the same time, the experience of cancer itself brings fear, uncertainty, grief about body changes and fertility, financial and family pressures, and worry about the cancer coming back. Night sweats and poor sleep make everything harder to cope with, and tiredness from treatment adds to the strain. Some hormone therapy medicines can also affect mood in some women. It can be hard to tell which changes come from menopause, which from the emotional impact of cancer, and which from tiredness, and usually all three play a part. Mood changes are not a sign of weakness or of failing to cope. They are common and treatable. Helpful approaches include improving sleep, regular physical activity, relaxation and mindfulness, talking with people you trust, counselling or cognitive behavioural therapy, support groups, and, when needed, medicines for anxiety or depression that are chosen carefully to fit with your cancer treatment. Seek help promptly if low mood persists or you have thoughts of harming yourself.

You are not alone

Mood changes are very common after breast cancer treatment.

Several causes overlap

Hormones, sleep, tiredness and the stress of cancer all contribute.

Help works

Talking therapies, lifestyle changes and medicines can all make a difference.

Professional support is helpful when mood changes last or affect daily life.

When to seek help

If low mood, anxiety or irritability last more than two weeks, or affect work, family or sleep, talk to your team.

Talking therapies

Counsellors and psychologists offer CBT and other effective approaches.

Medicines

Antidepressants or anti-anxiety medicines may help. Some can also ease hot flushes, but interactions with hormone therapy must be checked.

Psycho-oncology services

Many cancer centres have specialist psychological support.

Urgent help

If you have thoughts of harming yourself, contact emergency services or a crisis helpline immediately.

Talking therapies are effective for anxiety, low mood and irritability after breast cancer, and they can be used alongside or instead of medicines.

Cognitive behavioural therapy

CBT helps you notice patterns of thinking that make distress worse, such as expecting the worst or feeling you must cope alone, and practise more balanced ways of thinking and responding. It also includes practical skills for managing worry and sleep.

Mindfulness-based approaches

Mindfulness teaches you to notice thoughts and feelings without being overwhelmed by them. Programmes designed for people with cancer have shown benefits for stress, anxiety and mood.

Acceptance-based therapy

These approaches help you make room for difficult feelings while focusing on what matters most to you.

Couples and family therapy

When mood changes affect relationships, sessions with a partner or family can help everyone understand and support each other.

Group support

Support groups offer connection with others who understand, which reduces isolation.

How to access therapy

Ask your oncology team about psycho-oncology services. Many psychologists also offer online sessions, which can be easier to fit around treatment and family life.