The pain in the stomach when lying down, standing and sitting pain will be relieved, may be caused by the following reasons: 1, there may be certain lesions or inflammation of the abdominal wall, peritoneum and lead to abdominal pain, when lying down due to the effect of gravity, the abdominal wall will be concave downwards, there is the force of pulling the abdominal wall or peritoneum lead to pain aggravation, stand up will be symptomatic relief. 2, there may also be diseases of the intestinal tract, such as The symptoms may also occur due to gastrointestinal disorders, acute and chronic gastroenteritis, intestinal spasms, etc. 3, if the woman may be caused by inflammation or lesions of the uterine adnexa, such as tumors of the uterus or twisted ovarian cysts, or even dysmenorrhea and endometriosis.