Symptoms of soreness on the left side of the body: 1. may be caused by kidney stones on the left side or acute myocardial infarction leading to painful symptoms on the left side. 2. may be caused by gastric perforation accompanied by acute diffuse peritonitis, splenic rupture, which will cause significant pain on the left side of the body. 3. may be caused by diseases of the neurovascular system, cerebrovascular system, such as cerebral infarction, cerebral hemorrhage, etc. Therefore, when symptoms of soreness on the left side of the body occur, patients should rest in bed, avoid strenuous activities, and give appropriate symptomatic treatment, such as topical anti-inflammatory and analgesic drugs or physical therapy, to relieve the symptoms of soreness. If there is no improvement in the symptoms of soreness within a short period of time, or if the condition is progressively aggravated, it is necessary to go to a regular hospital in a timely manner to improve the necessary auxiliary examinations and choose the appropriate treatment method after the cause is clear.