The site of your pain in tennis elbow is wherever some tendons through the forearm muscles attach into the bone throughout the elbow. The pain is thought to be because of swelling or thickening with the tendon at first and ultimately degeneration (wearing) of your tendon. Blood is taken from https://www.theorthopaedicandpainpractice.com/how-to-alleviate-tennis-elbow-pain-tips-from-a-medical-expert/