Mood changes, anxiety and low mood on hormone tablets

They can for some women. Tamoxifen and aromatase inhibitors change oestrogen levels or signals, and oestrogen influences brain chemicals that regulate mood, sleep and emotional balance. Some women notice irritability, tearfulness, anxiety or low mood after starting hormone therapy. At the same time, many other things affect mood after breast cancer: fear of recurrence, changes in body image, relationship strain, tiredness, poor sleep from night sweats, and the emotional aftermath of treatment. Low mood and anxiety are common and treatable, and they deserve the same attention as physical side effects.

How to tell what is causing it

It can be hard to separate the effect of the tablets from everything else. Noting when symptoms started, how they changed with treatment and what makes them better or worse helps your team understand what is going on.

What helps

Talking therapies such as counselling or cognitive behavioural therapy, regular exercise, better sleep, support groups and, when needed, medicines for depression or anxiety chosen carefully to avoid interactions with tamoxifen.

When to seek help urgently

If you feel hopeless, think about harming yourself, or feel unable to cope with daily life, contact your doctor straight away or seek emergency help. These feelings can be treated.

Studies differ on how much hormone tablets themselves affect mood. What is clear is that emotional difficulties are common after breast cancer, and that women who get support tend to cope better and are more likely to stay on their treatment.

You do not have to push through alone

Many women feel they should be grateful and cheerful now that active treatment is over. Struggling emotionally is not a failure, and asking for help is a sign of strength.

Medicines can help, but must be chosen carefully

If you take tamoxifen, some antidepressants can reduce how well it works. Your team or a psychiatrist can choose one that is safe. Never stop tamoxifen or start a new medicine without advice.

Switching tablets is sometimes considered

If mood changes seem clearly linked to a particular tablet, your oncologist may discuss switching as part of a wider plan.

What this page cannot tell you

It cannot diagnose depression or anxiety. Ask your team for an assessment and support that fits your needs.

Fear of recurrence is one of the most common emotional challenges after breast cancer. It often flares before scans, on anniversaries or when a new ache appears.

Know what to watch for

Having a clear list of symptoms that need reporting helps you separate everyday aches from signs that need attention, which reduces constant worry.

Limit reassurance-seeking

Repeatedly checking the body or searching online can feed anxiety. A counsellor can teach techniques to manage these urges.

Ask for help if fear dominates

If worry stops you enjoying life, sleeping or working, talk to your team. Specific therapies for fear of recurrence are effective.

Many women are unsure what happens when they tell their team they are struggling emotionally. Knowing the usual steps can make it easier to speak up.

A conversation first

Your oncologist or nurse will ask how you have been feeling, how long it has lasted, how it affects sleep, appetite, work and relationships, and whether you have had thoughts of harming yourself. These questions are routine and help decide the right support.

Counselling or talking therapy

Many centres can refer you to a psycho-oncologist, psychologist or counsellor. A short course of sessions, in person or online, teaches practical ways to manage worry, low mood and fear of recurrence.

Medicines when needed

If symptoms are moderate or severe, a psychiatrist or your doctor may suggest medicine. With tamoxifen, they will choose one that does not weaken its effect, and review how you feel after a few weeks.

Support groups

Meeting other women who have been through breast cancer, in hospital groups or online communities, reassures many that they are not alone.