Forearm pain in the arm is commonly caused by osteoarthritis of the elbow joint, humeral epicondylitis and other causes, as follows: First, osteoarthritis of the elbow joint: overexertion and excessive weight bearing of the elbow joint will lead to accelerated degenerative changes in the elbow joint. Patients will have elbow joint pain and radiating pain in the forearm, and at the same time, it will be accompanied by limited movement of the elbow joint, and in severe cases, it will also show the deformity of the elbow joint. Second, humeral epicondylitis: also known as tennis elbow, is an inflammation of the common tendon stop of the forearm extensor muscle, the patient may have pain in the lateral elbow joint and forearm pain, the patient can not complete the towel wringing action, daily life will be seriously affected, the pain point is relatively fixed. After closed injection and extracorporeal shock wave treatment, the inflammation can be reduced and the pain symptoms can be relieved or even disappear completely. Through the above analysis, we can know the common causes of forearm pain in the arm, and early treatment can lead to satisfactory relief of symptoms.