When the anterior rotator teres syndrome enters the forearm from the upper arm, it passes between the two muscle fibers of the anterior rotator teres, and the hyperplasia and hardening of the muscle fibers or excessive muscle hypertrophy can cause compression at the entrance of the nerve band of the anterior rotator teres, resulting in reduced finger flexion strength and decreased sensation in the thumb, index finger, and middle finger. Treatment includes reducing the rotational activities of the forearm, applying topical anti-inflammatory and analgesic ointment to the forearm, as well as nerve nourishing treatment with oral methylcobalamin or intramuscular adenosylcobalamin. If the symptoms are gradually relieved, it can be used daily first, and if the symptoms recur, surgery should be taken. Surgery is relatively simple, and the symptoms will be gradually relieved when the symptomatic nerve enters the entrance of the rotary anterior circular muscle, and the nerve will be sent for examination by removing the fiber bundle of the muscle, without any dense tissue compressing the median nerve.