What is tennis elbow?
Tennis elbow, or lateral epicondylitis, is a painful condition of the outside of the elbow. The pain is usually felt just below the spot where the elbow's bone sticks out.

Some people can feel the pain from tennis elbow from the spot below the elbow all the way down to the wrist. It can be painful to straighten out your arm, as well. The pain, caused by repetitive lifting or bending, can last for several weeks or longer.