Subcervical pectoral muscle pain may be an adverse symptom caused by pectoral muscle strain, or discomfort caused by diseases such as clavicular osteoarthritis and pleurisy, and it is recommended to consult the doctor in time for relevant examinations. 1. Pectoral muscle strain: Pectoral muscle strain will cause pain in the lower neck pectoral muscle, there will be obvious soreness, there may also be edema, which will limit the ability to move, after overwork or strenuous exercise, the symptoms will be more intense, and some patients will worsen the disease after getting cold. 2. Clavicular arthritis: pain in the chest muscle under the neck may also be the discomfort caused by clavicular arthritis, there will be obvious swelling around the clavicular joints, pain and other adverse symptoms, pain will be aggravated by upper limb activities, and bulging of the chest muscle under the neck may occur. This kind of disease will make the weight-bearing capacity of the upper limbs decrease, and the disease will be aggravated when lifting heavy objects. 3. Pleurisy: Pleurisy may also cause subcervical chest muscle pain, with this disease will appear around the chest pain, chest tightness and other adverse symptoms, there may be pressure and pain, deep breathing or coughing pain will be aggravated, some patients chest and back or shoulder pain will also occur. It is recommended to consult a doctor in time for examination to find out the cause of the disease, and then choose the appropriate treatment under the guidance and advice of the doctor to avoid delaying the disease.