Tennis elbow (lateral epicondylitis) refers to an injury to your outer elbow tendon that occurs immediately after challenging overuse from the muscles and tendons of the forearm, in close proximity to the elbow joint.  In order for tennis elbow to generally be diagnosed you’ll want an evaluation from a Health care professional. https://www.theorthopaedicandpainpractice.com/how-to-alleviate-tennis-elbow-pain-tips-from-a-medical-expert/