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Mesenteric ischemia is a serious vascular condition characterized by reduced or blocked blood flow to the small intestine, leading to tissue damage and potential necrosis. It can be classified into acute and chronic forms. Acute mesenteric ischemia often occurs suddenly due to arterial embolism, thrombosis, or severe hypotension, making it a medical emergency with high mortality if untreated. Chronic mesenteric ischemia typically develops gradually due to atherosclerosis, causing narrowing of mesenteric arteries.

Patients with acute mesenteric ischemia commonly present with severe abdominal pain disproportionate to physical findings, nausea, vomiting, and sometimes bloody stools. In chronic cases, symptoms include postprandial abdominal pain, unintended weight loss, and fear of eating due to discomfort.

Diagnosis involves imaging studies such as CT angiography, which helps identify vascular obstruction. Early intervention is critical and may include anticoagulation, thrombolysis, endovascular procedures, or surgery to restore blood flow and remove necrotic bowel segments if necessary.

Risk factors include advanced age, cardiovascular disease, atrial fibrillation, and smoking. Prompt recognition and treatment are essential to prevent complications like sepsis, bowel infarction, and death.