The pain in the deltoid muscle when the arm is lifted can be considered as lactic acid buildup, inflammation, tendon strain, and cervical spondylosis, etc. It is recommended that further examination be conducted to take physical, medication, or surgical treatment. 1. Strenuous exercise after a long period of inactivity may lead to excessive accumulation of lactic acid, resulting in soreness and pain, generally do not need treatment, pay attention to rest and local massage. 2. If the deltoid muscle is overworked, improperly exerted, etc., it is recommended to carry out local external fixation, acupuncture, grilling and other treatments according to the degree of injury, as well as oral anti-inflammatory drugs such as celecoxib, ibuprofen, etc., and perform surgical repair treatment if necessary. 3. If the imaging examination is clearly due to radiculopathy, it is recommended to carry out neck traction treatment, take anti-inflammatory and pain-relieving drugs such as diclofenac sodium and nutritive drugs such as methylcobalamin, and if necessary, carry out surgical resection of the intervertebral disc and other treatments. Therefore, it is recommended to go to the hospital for further examination to clarify the cause of the disease, and carry out appropriate treatment under the guidance of the doctor, do not blindly use drugs.