Abdominal pain the day after crunches may be caused by lactic acid buildup or due to muscle tears, and treatment options include physical therapy and medication. 1. Lactic acid buildup: Excessive exercise may cause anaerobic metabolism in the muscles, resulting in a buildup of lactic acid that leads to abdominal pain. Patients need to reduce the abdominal force, followed by baths, abdominal massage, baking and other ways to accelerate blood circulation, rapid discharge of lactic acid and other metabolic products. 2. Muscle tear: abdominal strenuous exercise may lead to muscle tears caused by abdominal pain, the patient needs to reduce abdominal exercise within 72 hours, while ice packs abdominal muscle groups, reduce edema; 72 hours after the hot packs can be carried out to promote blood circulation; pain in patients with significant oral ibuprofen, loxoprofen and other drugs as appropriate, to relieve pain. If the patient’s abdominal pain symptoms are serious, or the symptoms continue without improvement, should promptly go to the hospital for treatment. The above drugs should be used under the guidance of a doctor, avoid self-medication.