Pain on both sides of the stomach may be muscle soreness or abdominal pain. Abdominal pain can be caused by a variety of reasons, including somatic abdominal pain, visceral abdominal pain and referred pain. 1. Muscle aches and pains: after strenuous exercise, muscles can experience temporary ischemia, which can cause lactic acid to push up and cause symptoms of muscle aches and pains. 2. Somatic abdominal pain: abdominal wall contusion, herpes zoster, etc. will stimulate the nerves on the abdominal wall or peritoneal wall layer, resulting in pain. 3. Visceral abdominal pain: visceral abdominal pain is abdominal pain caused by the pain sensation produced by the injury of intra-abdominal organs, and its pain sensation localization is vague. For example, acute appendicitis can have metastatic right lower abdominal pain. 4. Involvement pain: the nerves innervating a viscera and the nerves innervating a surface area come from the same spinal cord segment, so the pain produced by the viscera can be transmitted to the corresponding surface area, resulting in involvement pain. For example, bilateral ureteral stones can produce pain on both sides of the waist or lower abdomen. In short, there are many reasons for pain on both sides of the stomach, if the pain on both sides of the stomach is not relieved, or accompanied by other symptoms, you should go to the hospital in a timely manner, to clarify the cause of the targeted treatment or treatment.