The clinical causes of left-sided abdominal soreness are relatively numerous and complex. The most common ones include urinary stones and ureteral stones on the left side leading to hydronephrosis, which may still cause left-sided abdominal soreness and sometimes radiating pain to the perineum. Abdominal wall muscle strains, including strenuous activity and running sports, causing damage to the left rectus abdominis or abdominal wall muscles, can also cause symptoms of soreness and pain in the abdomen, sometimes affecting abdominal movement. For internal organs caused by, for example, chronic colorectal inflammation, pain on the left side is accompanied by diarrhea or constipation, etc. When left-sided abdominal pain occurs, it is important to go to a regular hospital to find the cause and to carry out systematic and standardized treatment according to the cause.