Pain in the left shoulder joint is primarily considered to be frozen shoulder, which most often occurs in adults over the age of 40. It is more common in women than in men. Frozen shoulder is a collective term for a group of diseases, including supraspinatus tendonitis, infraspinatus tendonitis, subacromial bursitis, biceps, long head tendon, tenosynovitis and subacromial impingement syndrome, etc. The specific treatment includes regular functional exercises for the shoulder joint, localized heat and physiotherapy, and the use of NSAIDs. Specific treatments include regular functional exercises for the shoulder joint, localized hot compresses and physiotherapy, oral non-steroidal anti-inflammatory and analgesic drugs and blood-activating and pain-relieving traditional Chinese medicines, and localized pain points can be treated with closed needles. If the treatment is not effective, arthroscopic shoulder joint cavity exploration and cleaning surgery is needed.