You eat as usual and, a few minutes later, a pain begins in your abdomen that will not go away. You start eating less because every meal hurts. Behind that pattern there may be chronic mesenteric ischaemia: the intestine is not getting the blood it needs. Here we explain, in plain language, what it is, how to tell the chronic form from the emergency, and what can be done.
What mesenteric ischaemia is
Mesenteric ischaemia is a lack of blood supply to the intestine. The mesenteric arteries, which carry blood to the digestive system, narrow or become blocked, and the intestine does not get the oxygen it needs, especially when it is working hardest: during digestion.
That shortfall in blood flow can set in slowly, over months or years, or appear all at once. That difference changes everything, because it determines whether we are dealing with a problem to be studied in a consultation or with a medical emergency.
Chronic and acute forms: the key difference
The chronic form advances slowly and causes symptoms that recur with meals. The acute form appears suddenly, with intense and continuous abdominal pain, and is an emergency. Recognising which of the two you are facing is the most important part of the whole picture.
In chronic mesenteric ischaemia, the typical symptom is belly pain that appears after eating, usually within a few minutes. Because every meal hurts, you may develop a fear of eating and gastrointestinal upset. As a result, you eat less and lose weight without meaning to. It is a picture that allows time to study it.
Acute mesenteric ischaemia is another matter. It usually starts with sudden, intense abdominal pain that does not ease and does not match what the physical examination shows. When the blood supply is cut off abruptly, the intestine suffers acutely. That is why, faced with sudden, severe abdominal pain that does not let up, the right thing to do is to go to the emergency room without waiting.
| Chronic ischaemia | Acute ischaemia | |
|---|---|---|
| How it starts | Little by little, over months or years | Suddenly |
| Pain | After eating, recurring with meals, especially large ones | Intense and continuous, does not ease |
| Other signs | Fear of eating, weight loss, nausea, vomiting, changes in bowel transit | General malaise |
| What to do | Scheduled study in a consultation | Go to the emergency room without delay |
Why it happens: risk factors
The cause depends on the form. In the chronic form, the usual culprit is atherosclerosis: the same plaques that narrow arteries throughout the body also affect those that supply the intestine. In the acute form, the origin is often a clot that travels to a mesenteric artery and blocks it all at once.
That clot usually comes from the heart. This is why atrial fibrillation, a common arrhythmia, is a risk factor: it makes it easier for clots to form that can later break loose. The factors that damage arteries in general also count here:
- Smoking: one of the main accelerators of atherosclerosis.
- High blood pressure, diabetes, high cholesterol and chronic kidney disease: they damage the arterial wall.
- Age and known arterial disease in other areas: if your arteries may be diseased elsewhere, they can be here too.
The key is thinking of it in the first place. A patient who eats less because their belly hurts and is losing weight deserves to have intestinal angina ruled out, not just to have their stomach checked.
How it's diagnosed
Diagnosis relies on imaging tests that study the arteries of the abdomen. The reference test is the CT angiogram, a contrast-enhanced scan that shows where the narrowing or blockage is and what it is like. Doppler ultrasound, an ultrasound that assesses how the blood flows, can also be useful as an initial approach to diagnosis or in follow-up, but it is not the gold standard.
Before the tests, the clinical history already points the way: the pattern of pain after eating, the weight loss and the cardiovascular background. A differential diagnosis is worthwhile, because abdominal pain after meals can also be due to other digestive, biliary or gastric problems. The aim is to tell a blood-supply problem apart from other, more common causes.
How it's treated
Treatment aims to restore blood flow to the intestine and control the underlying cause. In the chronic form there are two main ways to reopen the artery, and the choice depends on the type of lesion and your general condition.
- Endovascular revascularization: done through a catheter, for example with angioplasty or a stent, without open surgery. It usually means a faster recovery when the lesion is suitable for this technique.
- Surgery: using a bypass or other techniques to route around the narrowed area. It is considered when the endovascular route is not the best option.
In parallel, the risk factors are managed: quitting smoking, looking after blood pressure, blood sugar and cholesterol, and treating atrial fibrillation if present. The acute form, for its part, is managed in hospital as an emergency, because time matters. There is more detail on the chronic mesenteric ischaemia treatment page, and if this picture fits you, you can request a vascular assessment.
In summary
Mesenteric ischaemia is a lack of blood supply to the intestine, and how serious it is depends on the form. The chronic form is recognised by pain after eating, a fear of eating and weight loss, and leaves room to study it calmly. The acute form is a sudden, intense pain that requires going to the emergency room. If you recognise yourself in the chronic pattern, a vascular assessment with a CT angiogram or Doppler ultrasound can put a name to what is happening and open the door to the right treatment.