About this condition
Ischaemic colitis happens when the blood supply to part of the large intestine is reduced. It can cause sudden abdominal pain and rectal bleeding and may be serious even when earlier symptoms were mild.
What matters most
Blood in the stool does not by itself prove ischaemic colitis; infection, inflammation and other causes are possible. Sudden pain with bloody diarrhoea or weakness is a warning combination that needs urgent evaluation.
Symptoms and reasons to seek help
Symptoms can include abruptly starting cramping abdominal pain, urgent bowel movements, diarrhoea with blood, nausea or dizziness. Severity varies, and low blood pressure or fainting increases concern.
How it differs from similar conditions
It is important to distinguish reduced colonic blood flow from infectious or inflammatory colitis and other acute abdominal emergencies. The diagnosis cannot safely be established from a website symptom checklist.
Assessment and investigations
Hospital assessment may include vital signs, blood tests, CT and other investigations chosen by the medical team. Clinicians evaluate bowel injury and exclude more dangerous causes of bleeding and severe abdominal pain.
Care options and limitations
Acute suspected ischaemic colitis is not suitable for self-treatment. Management may require hospital monitoring and treatment of reduced blood flow or complications; selected severe cases need surgical care. Follow-up is planned after stabilisation.
When emergency help is needed
Sudden severe abdominal pain with bloody diarrhoea, significant rectal bleeding, cold sweating, fainting or low blood pressure is a medical emergency. Call 103 or 112 immediately; do not book a routine gastroenterology appointment for these symptoms.
Related information
Diverticular disease of the intestine; Functional oesophageal disorders; Cholecystitis.
Signs and symptoms
Symptoms can include abruptly starting cramping abdominal pain, urgent bowel movements, diarrhoea with blood, nausea or dizziness. Severity varies, and low blood pressure or fainting increases concern.
Diagnosis and tests
Hospital assessment may include vital signs, blood tests, CT and other investigations chosen by the medical team. Clinicians evaluate bowel injury and exclude more dangerous causes of bleeding and severe abdominal pain.
Care and treatment approaches
Acute suspected ischaemic colitis is not suitable for self-treatment. Management may require hospital monitoring and treatment of reduced blood flow or complications; selected severe cases need surgical care. Follow-up is planned after stabilisation.
When to seek urgent care
Sudden severe abdominal pain with bloody diarrhoea, significant rectal bleeding, cold sweating, fainting or low blood pressure is a medical emergency. Call 103 or 112 immediately; do not book a routine gastroenterology appointment for these symptoms.
Frequently asked questions
Does any blood in the stool mean ischaemic colitis?
No. Bleeding has several possible causes, but sudden pain with blood must be assessed promptly.
Does ischaemic colitis always require an operation?
No. Management depends on severity; some cases improve without surgery after appropriate hospital evaluation.
Can I book routine care instead of attending emergency services?
Not for sudden severe pain, major bleeding or collapse. Those symptoms require emergency assessment first.
Important information
A medical consultation is needed for diagnosis and treatment recommendations.
Self-treatment can be harmful to your health.
