Tennis elbow, or lateral epicondylitis, develops when the forearm muscles that connect to the outside of your elbow become irritated. This can cause pain and tenderness that’s usually located on the outside (lateral) part of the elbow. There are several simple tests you can do to determine if you have tennis elbow. You can do most of these tests on your own, but a few do require the assistance of a doctor or medical professional.
Source: Healthline
