In-depth

Esophageal varices

Esophageal varices — enlarged veins in the esophagus — are a serious complication of liver diseases such as cirrhosis.

Food poisoning

Food poisoning has many forms, and some can be serious. Here's how to recognize food poisoning and ways to prevent getting sick.

H. pylori infection

H. pylori infection, a common bacterial infection, can cause ulcers, inflammation of the stomach lining and some stomach cancers.

Peptic ulcer

Peptic ulcers are painful sores that commonly affect the lining of your stomach and upper small intestine. The most frequent cause is a treatable infection.

Yellow fever

A vaccine can protect you against yellow fever — a sometimes deadly mosquito-borne disease found in sub-Saharan Africa and South America.

Apr. 28, 2011