Prostate cancer and pain in the anus: what to know

The prostate lies close to the rectum, so pressure or irritation in the pelvis can be felt behind the anus, in the perineum, or during bowel movements. Cancer is only one possible explanation. Haemorrhoids, an anal fissure, infection, constipation, pelvic-floor tension, and other prostate conditions can also cause pain.

Describe whether the discomfort is burning, sharp, aching, or pressure-like; whether it follows sitting, passing stool, urinating, or sex; and whether there is bleeding, discharge, fever, constipation, or urinary change. These details help a clinician decide whether examination, urine testing, imaging, or another assessment is appropriate.

Arrange a clinical assessment for persistent, recurrent, or unexplained anal pain, especially if you have a prostate cancer diagnosis or treatment history. Do not insert medicines or objects into the rectum without professional advice. Keep stools soft with fluids and fibre if suitable for you, and ask before taking pain medicines if you use blood thinners or have bowel or kidney problems.

Mention urinary symptoms such as difficulty passing urine, changes in bowel habit, and any treatment such as surgery or radiotherapy. A symptom alone cannot identify its cause, and most anal pain has explanations other than cancer.

Seek urgent care for severe or rapidly worsening pain, heavy rectal bleeding, black stools, fainting, fever with chills, inability to pass urine or stool, repeated vomiting, or new leg weakness or numbness. Contact your oncology team promptly if pain is new during treatment or is no longer controlled by the agreed plan.

What examinations could identify the cause? Could my treatment affect the bowel or pelvic tissues? Which pain medicines are suitable with my current medicines? What bowel changes should I report? Should I see an oncology, urology, colorectal, or pain specialist?