What does persistent fatigue feel like with bowel cancer?

Bowel cancer can cause fatigue through anaemia from blood loss, inflammation, reduced appetite, disrupted sleep, or the effects of treatment. You may find that walking, cooking, or working takes more effort and that a night's sleep does not restore your usual capacity. Changes in bowel habit, abdominal discomfort, visible blood, dark stools, or unplanned weight change should be recorded and shared with a clinician. Fatigue alone has many possible explanations.

Tell your cancer team how fatigue changes your day and whether you have bowel symptoms, reduced appetite, dizziness, or breathlessness. They can assess blood counts, bleeding, nutrition, medicines, and treatment effects. Prioritise essential tasks, take planned breaks, keep fluids nearby, and choose manageable movement if your team agrees. Do not dismiss ongoing bleeding or begin iron without advice about the cause of anaemia.

Contact your team promptly for new or worsening blood in the stool, black stools, repeated vomiting, increasing abdominal swelling, or fatigue that sharply limits activity. Seek urgent care for fainting, severe abdominal pain, heavy bleeding, chest pain, or breathlessness at rest. A sudden change needs assessment even if previous fatigue was mild.

Could blood loss or anaemia be contributing? Which bowel changes should I report? Do I need blood tests or a treatment review? What level of exercise and rest is appropriate?