What to expect from radiotherapy for anal cancer

Radiotherapy uses carefully aimed beams to treat the anal tumour and selected nearby lymph-node areas. At the planning visit, imaging helps the team map the treatment area and protect nearby organs. You lie in the same position for each session; the machine moves around you, but does not touch you.

The treatment itself is brief, and the radiographers leave the room while the machine operates. Radiotherapy is often combined with medicines, so your oncology team will explain how the schedules fit together. Irritation commonly builds as sessions continue and may take time to settle after the course.

Wash the treated area gently, pat it dry, and use only creams or dressings approved by your radiotherapy team. Wear loose, soft clothing and tell the team early about soreness, diarrhoea, urgency, burning urine, or difficulty opening your bowels. Small frequent meals and regular fluids may be easier if your bowel is unsettled.

Keep every appointment, including reviews between treatment sessions. Rest when tired but take gentle walks if you can. Ask about suitable pain relief and whether work, driving, or sexual activity should be adjusted during healing.

Call your oncology team promptly for uncontrolled pain, worsening skin breakdown, repeated diarrhoea, blood in the stool, inability to pass urine, or signs of dehydration such as dizziness and very dark urine. Seek emergency help for heavy bleeding, fainting, severe abdominal pain, or breathing difficulty.

Ask how the treatment area will be protected, which symptoms should be reported the same day, what skin products are safe, how combined medicines affect side effects, and when bowel, bladder, and sexual symptoms should be reassessed.