Flank pain usually occurs on either the left or right side of the abdomen, but it is possible to have it on both sides, too.

Medically reviewed by David Ozeri, MD Joint pain on one side of the body may be an indication of arthritis. Arthritis refers to a group of diseases that cause inflammation and swelling of one or more ...

There are also various reasons you might have pain or pressure only on the left side of your head. That said, though headaches can affect one or both sides of the head, having a headache on the ...