When is radiotherapy recommended for anal cancer?

Radiotherapy directs high-energy beams at the cancer and selected nearby areas. For many anal cancers, it is planned with medicines so the combined treatment can control the tumour while aiming to preserve normal bowel function and avoid surgery when possible. The plan depends on the tumour's exact position, size, lymph-node findings, general health and whether it has spread.

Radiotherapy may also be used when cancer returns or when symptoms from a local tumour need relief. The treatment team uses scans and examination to shape the radiation fields and protect nearby skin, bowel, bladder and reproductive organs as far as possible.

Before treatment, ask about planning scans, the number of visits, skin care, bowel changes, pain relief, nutrition and the medicines that may be given alongside radiation. Tell the team about inflammatory bowel disease, previous pelvic radiation, pregnancy, urinary symptoms and medicines. Keep the treatment area clean and follow the team's advice about washing, creams and clothing.

Report diarrhoea, bleeding, worsening pain, skin breakdown or difficulty eating early; the team can adjust supportive care and check for problems.

Seek prompt advice for heavy rectal bleeding, inability to pass stool or urine, severe abdominal pain, fever, repeated vomiting, or rapidly worsening skin damage. Breathing difficulty, collapse or confusion needs emergency care.

What areas will be treated and why? Will medicines be given with radiotherapy? How will treatment affect bowel, bladder, skin and sexual function? What can help with pain or diarrhoea? How will you check whether the tumour has responded?