Standing abdominal distension lying down better, can be considered with menstruation, chronic pelvic inflammatory disease, pelvic fluid or gastroptosis and other reasons. 1. Menstruation: some women during menstruation, due to pelvic congestion, physiological pelvic effusion can occur, in the standing will have obvious abdominal distension, lying down can relieve its symptoms. 2. Chronic Pelvic Inflammatory Disease (CPD): Chronic infection of pelvic tissues such as pelvic peritoneum, ovaries and uterus can cause CPD, which can also produce effusion in the pelvic cavity, resulting in lower abdominal distension, pain and lumbosacral pain, which will be aggravated by standing, and can be relieved by lying down. 3. Gastroptosis: after standing for too long after meals, there may be abdominal heaviness, distension, when lying down, the discomfort can be alleviated. If you have a feeling of bloating in the lower abdomen, it is recommended to consult a doctor in time, improve the pelvic ultrasound or CT and other related examinations to clarify the cause of the disease and then carry out targeted treatment.