The elbow is the insertion point for several forearm muscles. A strain or irritation of the insertion of these muscles via the tendon can leave you with a sore elbow. Tennis elbow is generally sore on the outside of the elbow and Golfer's elbow is generally sorer on the inside of the elbow. These conditions can occur outside of sports such as carrying a young child during infant years or computer use.
Both conditions are caused by repetitive strain on the tendon causing it to have micro-tears within the tendon. There is very strong evidence for physiotherapy as an intervention in both Golfers and Tennis elbow. Treatment generally consists of intially ice to reduce the inflammation followed by specific gradual muscle loading to promote healing of the tendon. Other modalities that can be used are soft tissue releases as well as ultrasound or dry needling.