Stomach ulcers, or peptic ulcers, are sores in the lining of the stomach or the top part of the small intestine. Stomach ulcer pain often occurs in the upper part of the abdomen. Doctors classify the ...
A blood clot, or thrombus, is a collection of blood cells that forms inside a blood vessel, impeding blood flow. Rarely, a blood clot may form in the abdomen. Doctors refer to this as mesenteric ...