Abdominal pain after doing sit-ups may be due to lactic acid accumulation, muscle strain and intestinal cramps, which can be relieved by rest, massage and hot compresses and the use of drugs. 1. Lactic acid accumulation: due to the short-term accumulation of a large amount of lactic acid in the abdominal muscles during exercise, usually after a reasonable rest, the patient will slowly relieve themselves. 2. Muscle strain: may be caused by abdominal muscle strain. Appropriate massage of the abdomen, but also through the local hot compresses to improve the way. 3. Intestinal spasm: If the action is too intense in the process of sit-ups, it is likely to lead to intestinal smooth muscle spasm, which in turn causes abdominal pain. Can take antispasmodic drugs such as cetonium bromide, which helps to quickly release the smooth muscle spasm, to achieve the effect of relieving abdominal pain. If abdominal pain after doing sit-ups, it may also be related to cold, soft tissue injury, etc., should go to the hospital in time for examination and treatment.