Sometimes ulcers can cause complications, such as bleeding, perforation, penetration, or obstruction.

Treating ulcers in the stomach caused by bacteria called H. pylori.

Left untreated, an ulcer can cause life-threatening problems.

Some ulcers do not cause symptoms.

Heavy menstruation, ulcers, injury, or surgery can cause enough blood loss to lead to iron-deficiency anemia.

Small ulcers may not cause any symptoms.

An aphthous ulcer which has formed on the uvula can also cause swelling and discomfort.

Bleeding ulcers and bloody diarrhea can cause it.

But a perforated ulcer in 1940, he said later, caused his weight to drop from 160 pounds to 100.

A perforated ulcer had caused an infection in Johnson's organs.