Causes of lower abdominal swelling or a pulling sensation and flatulence are pelvic inflammatory disease, proctitis, rectal tumors and so on. 1. Pelvic inflammatory disease: when the patient suffers from this disease, the pelvic secretion of inflammatory fluid constantly stimulates the pelvic fascia, muscles and adjacent and other medications rectal tissues, resulting in lower abdominal distension and discomfort. Due to the inflammatory reaction involving rectal tissue affecting the exhaust, there will also be a feeling of flatulence. 2. Proctitis: the rectum is the last section of the intestine, when inflammation occurs in the rectum degeneration, rectal tissue congestion and edema will have a feeling of bloating; mucosa continues to secrete inflammatory mediators adhering to the nearby fascia appeared to be tugging. Deformation of rectal tissue affects the normal excretory function, resulting in flatulence. 3. Rectal tumor: when the tumor occurs in rectum, the tumor keeps falling down and pulling the fascia and blocking the intestinal tract, resulting in discomfort such as swelling and pulling. When the tumor blocks the intestinal tract and affects the normal function of intestinal excretion, there will be abdominal distension and other discomforts. When the patient has discomfort such as lower abdominal distension, pulling sensation and flatulence, he/she can go to the hospital for examination to clarify the cause of the disease, such as fingerprinting, abdominal ultrasound, colonoscopy, and so on.