Anterior rotator teres syndrome is a disorder in which the median nerve enters the anterior rotator teres muscle and travels between the two starting points of the anterior rotator teres muscle and is compressed by the muscle fibers, resulting in median nerve entrapment. The entrapment of the median nerve in the pronator teres muscle position can cause distal hand dysfunction, such as reduced finger flexion strength, numbness in the fingers, especially in the thumb, index finger, and middle finger, and a certain reduction in thumb-to-palm function. The symptoms of hand numbness are exacerbated during anterior rotation against resistance, and with a snap at the location of the entrance of the anterior circular muscle, there may be radiating pain to the distal end of the nerve due to demyelination changes. The diagnosis can be confirmed if the nerve conduction velocity is reduced at the site of the anterior rotator muscle. Conservative treatment for anterior rotator syndrome may include less forearm rotation and oral or intramuscular injections of nerve-nourishing drugs. If the symptoms do not improve significantly, surgery should be actively performed. The compression of the median nerve at the entrance of the anterior rotator muscle will be completely released and the function will be gradually restored.