The anterior rhomboid symptom group occurs in middle-aged adults, more in women than in men, and more on the right side than on the left side. Patients generally present with underdeveloped muscles of the drooping shoulder and scapular girdle. The symptoms vary depending on the tissue under pressure. These symptoms are described below for diagnostic purposes. Tightness of the oblique muscles may slightly restrict the rotation of the neck. Excessive tension of the oblique muscles may cause pain in the upper part of the medial border of the scapula and its medial region, involving the chest in the forward direction, and in the lateral direction, causing pain in the front and back of the arm, the radial side of the forearm, and sometimes extending to the thumb and index finger, with numbness in the thumb and insensitivity to cold sensation; at rest after activity, this pain is often present in the left side of the chest and can be misdiagnosed as coronary artery disease It can be misdiagnosed as coronary artery disease. When the patient has pain at the medial edge of the superior scapula, massage of the upper arm will complain of shoulder pain; when the subclavian artery and the brachial plexus nerve are compressed at the same time, the patient often supports the head with his hand to tilt it to the affected side, thereby relieving the tension of the anterior trapezius muscle. Tension and pressure pain of the anterior trapezius muscle can be found in the supraclavicular fossa. Compression of the muscle leads to heavy pressure and radiating pain, which is aggravated by neck extension. Sometimes there is hypersensitivity and coldness in the hand, dyskinesia and loss of reflexes. Local injections of anesthetics can relieve the spasm of the anterior oblique muscle to relieve the symptoms. Their sleep quality is also affected by the increased pain at night, and patients may choose to sleep in a sitting position or use pillows to achieve pain relief by avoiding continuous shortening of the oblique muscles. When the brachial plexus nerve is hooked as it leaves the first rib and becomes entrapped by the trapezius muscle, symptoms such as numbness and tingling in the arm and occasional inadvertent dropping of objects from the hand may occur. When the oblique angle muscle is stuck in the subclavian vein or lymphatic duct, the patient may experience swelling of the four fingers and the back of the hand, stiffness of the fingers, and difficulty in bending the interphalangeal joints of the fingers to make a fist with them extended. Injury to the oblique angle muscle can also cause problems with some of the respiratory muscles, causing breathing panic and chest tightness.