The location of the pain in tennis elbow is wherever some tendons from the forearm muscles attach for the bone across the elbow. The pain is thought to be attributable to swelling or thickening on the tendon initially and at some point degeneration (donning) on the tendon. Blood is taken https://www.theorthopaedicandpainpractice.com/how-to-alleviate-tennis-elbow-pain-tips-from-a-medical-expert/