Lower abdominal distension in the bedridden elderly can be considered to be related to urinary retention, gastrointestinal disorders, or disorders leading to the development of pelvic effusion, among other causes. 1. Urinary retention: prostate diseases such as prostatic hyperplasia, urethral mechanical obstruction such as urethral calculi, neurogenic diseases and other causes can lead to urinary retention, bladder filling, urination difficulties and lower abdominal distension and pain and other symptoms. 2. Gastrointestinal diseases: if bedridden old people have fecal impaction, colon cancer and other intestinal obstruction, abdominal pain, abdominal distension, stopping of defecation and other manifestations. 3. Pelvic effusion: ectopic pregnancy, pelvic inflammatory disease, pelvic tumors such as ovarian cancer, etc. can cause inflammatory exudate in pelvis to form pelvic effusion, and there are uncomfortable manifestations such as lower abdominal distension and pain. In addition, such as urethritis, cystitis, prostatitis and constipation and many other factors can be caused by bedridden elderly lower abdominal distension and pain, it is recommended to consult a doctor in a timely manner, targeted treatment.