Leptospirosis causes fever and headache, and in some cases kidney, lung, or heart problems. Often, the symptoms are not unique for the disease, which makes it difficult to diagnose, and is therefore ...

There are many types of liver disease, ranging from those that are treatable to those that require a liver transplant. Learn about symptoms, causes, and more.

Upper stomach pain can mean gas, indigestion, or stomach viruses. More severe causes can include appendicitis, gallstones, bowel obstruction, or peptic ulcers.