A tendon on the left side of the posterior wall hurts. This condition is usually due to a strain on the medial scapular muscles of the erector spinae, scapularis, teres minor, and teres major, and is often combined with a cold condition. This condition is mainly due to the lack of support for the elbow joint in a seated position and prolonged head bowing, resulting in continuous fatigue of the muscles in this position. The following measures are usually taken to treat this condition: 1. First, when sitting, the elbow joints must be supported bilaterally, try to choose a seat with a backrest, and tilt your head back slightly to keep the muscles in this position fully relaxed, otherwise the treatment effect is not good. 2. The accumulation of metabolic products will lead to aggravation of the condition. You can use a warm water bag to increase blood circulation, promote inflammation metabolism, and relax the muscles. 3, if the pain is more sensitive, you can take oral non-steroidal anti-inflammatory painkillers, such as celecoxib, loxoprofen sodium, etc. can play a very good effect of reducing inflammation and reduce pain. 4, you can take oral ethylparisone hydrochloride tablets, this drug is a muscle relaxant, after oral intake can make the muscles in this location become relaxed, and the pain can be significantly better. 5.A topical ointment can be applied to invigorate blood stasis and relieve tendons and channels, such as dog skin ointment and wound pain relief to increase local blood circulation and promote the metabolism of inflammatory edema. Generally, after the above treatment, the symptoms will be significantly improved in 1-2 days.