Chemotherapy side effects: what to expect and when to get help

Possible effects include tiredness, nausea, appetite or taste changes, mouth soreness, bowel changes, hair loss, skin or nail changes, and altered blood counts. You may experience some, none or different effects across treatment cycles.

Chemotherapy damages dividing cancer cells but can also affect healthy cells that renew quickly, including cells in the mouth, gut, hair roots and bone marrow. This explains many common effects. Other medicines can affect nerves, kidneys, hearing, heart or skin, so the monitoring plan depends on the exact regimen.

Blood-count changes may reduce infection-fighting cells, red blood cells or platelets. That can lead to infection risk, breathlessness or unusual bleeding. Side effects do not show whether treatment is working; scans, examinations and other planned checks assess response.

Take anti-sickness and other supportive medicines exactly as prescribed, including scheduled doses given before symptoms start. Sip fluids regularly, choose small meals that are easier to tolerate, and use the mouth-care routine supplied by your clinic. Gentle activity balanced with rest may help energy and sleep.

Keep a brief record of symptoms, bowel changes, temperature readings and missed medicines. Bring it to appointments so the team can adjust supportive treatment or investigate a new problem. Do not start vitamins, herbal remedies, painkillers or over-the-counter medicines without checking for interactions.

Use the contact number provided by your oncology service rather than waiting for the next visit. Changes to the dose or schedule are clinical decisions and should never be made at home.

Call your oncology urgent-contact line immediately for a fever at or above the threshold your team gave you, chills, sudden severe illness, breathing difficulty, chest pain, confusion, uncontrolled vomiting or diarrhoea, inability to drink, or very little urine. Infection during chemotherapy can worsen quickly even without a high temperature.

Urgent assessment is also needed for uncontrolled bleeding, black stools, blood in vomit, a new widespread rash, facial or throat swelling, severe headache with weakness, or pain and swelling around an infusion line. If you cannot reach the oncology team, use emergency services and state that you are receiving chemotherapy.

Before treatment, ask which effects are most relevant to your regimen, when they may appear, what monitoring you need, which medicines to keep at home and who to call outside clinic hours. Confirm the fever threshold in your written instructions and whether any food, medicine, dental work or vaccination needs special planning.