Chemotherapy when you live with a mental health condition

Yes. Depression, anxiety, bipolar disorder, schizophrenia, obsessive-compulsive disorder, substance use problems and other mental health conditions do not stop anyone from having chemotherapy. People with these conditions have the same right to cancer treatment as anyone else. What makes the biggest difference is keeping mental health care going throughout treatment. Unfortunately, this is often where things go wrong. Psychiatric appointments are missed because of busy cancer schedules, medicines are stopped when someone is admitted to hospital or feels sick, and nobody tells the psychiatrist that cancer treatment has started. A cancer diagnosis, disrupted sleep, steroids and changes in routine can all unsettle mood, so continuity of care is essential rather than optional.

Some psychiatric and cancer medicines interact. Lithium levels can rise dangerously with vomiting, diarrhoea, dehydration or kidney changes from medicines such as cisplatin, so lithium levels and kidney tests may be checked more often. Clozapine and chemotherapy can both lower white blood cells, which needs close blood monitoring and coordination between psychiatrist and oncologist. Some antidepressants, when combined with certain anti-sickness medicines or pain relief, can rarely cause a reaction with agitation, sweating and muscle twitching. Some antipsychotics and anti-sickness medicines can affect heart rhythm, so an ECG may be done. Steroids can cause sleeplessness, irritability, low mood or, occasionally, elated or unusual behaviour, especially in people with bipolar disorder.

None of these are reasons to avoid treatment, but they are reasons for your psychiatrist and oncologist to share information. Bring a full list of psychiatric medicines to your oncologist and tell your psychiatrist about your cancer treatment plan. Only your doctors should change these medicines. Stopping psychiatric medicines suddenly can cause withdrawal symptoms or relapse.

Keep psychiatric appointments

Ask whether visits can be coordinated with cancer appointments or done by phone.

Tell the ward about your medicines

If admitted, make sure psychiatric medicines are continued unless a doctor decides otherwise.

Ask about psycho-oncology

Many cancer centres have counsellors or psychiatrists who specialise in people with cancer.

It cannot tell you whether your psychiatric medicines should change during chemotherapy. That depends on your condition, medicines and cancer treatment, and must be decided by your psychiatrist and oncologist together.

It also cannot replace urgent mental health care. If you are in crisis, seek help straight away.

Consent and decision-making

Having a mental health condition does not mean someone cannot make decisions about cancer treatment. Most people can. If a person is very unwell at a particular time, doctors may take extra steps to support decision-making, involve family, or wait until the person is better able to decide, where the cancer allows.

Stigma in cancer settings

Some people worry they will be treated differently if staff know about their mental health. Sharing your history helps staff keep you safe and support you, and your information is confidential. If you feel dismissed, ask to speak to a senior nurse or doctor.

Depression and anxiety caused by cancer

Many people without a previous mental health history develop depression or anxiety during cancer treatment. It is common and treatable, not a weakness. Ask for help if low mood or worry lasts or affects daily life.

Alcohol and substance use

Tell your team honestly about alcohol or drug use. Sudden stopping can cause withdrawal, which can be dangerous in hospital. Support is available.

Routines help

Regular sleep, meals, gentle activity and contact with supportive people help stabilise mood during treatment.

Coordinating appointments

Busy cancer schedules often squeeze out psychiatric follow-up. Ask your psychiatrist whether some reviews can be done by phone or video during treatment, and share your chemotherapy calendar so visits can be timed on better days. If you are admitted to hospital, ask the ward team to contact your psychiatrist or the hospital's psychiatry service.

Steroids and bipolar disorder

For people with bipolar disorder, steroids given with chemotherapy can occasionally trigger elevated mood, reduced need for sleep or agitation. Your oncologist may be able to reduce steroid use, and your psychiatrist may suggest temporary changes or closer monitoring around treatment days. Family members can watch for early signs.

Anxiety about procedures

Needle fear, fear of enclosed scanners and panic attacks during infusions are common. Tell your team; they can explain procedures step by step, allow a support person, use numbing cream, or offer relaxation techniques or medicines to help.

Memory and concentration

Chemotherapy, poor sleep and low mood can affect memory and concentration. Written instructions, phone reminders and a family member at appointments help. Tell your team if thinking problems worsen suddenly, as this needs checking.

Eating disorders

People with a history of eating disorders may find weight changes, appetite loss and diet advice during treatment especially difficult. Tell your team so dietitians and mental health professionals can support you together.

Sleep during treatment

Sleep problems are common during chemotherapy, especially on steroid days. Keeping regular bedtimes, limiting screens and caffeine, and short daytime rests rather than long naps help. If sleeping tablets are considered, your psychiatrist and oncologist should agree, as some interact with other medicines.

Carers need support too

Family members caring for someone with both cancer and a mental health condition can become exhausted. Carer support groups and counselling help them keep going.

Crisis planning

Agree a crisis plan with your psychiatrist before treatment, including early warning signs and whom to call.

What to do next

Tell your oncologist about your mental health condition and medicines, tell your psychiatrist about your cancer plan, ask both to communicate, keep psychiatric appointments, never stop medicines on your own, involve family if you wish, and seek urgent help for warning signs.