When abdominal distension is caused by the right lower abdomen, first consider gastrointestinal problems and also appendix problems. If the pain is obvious and accompanied by back pain, consider whether there is appendicitis. The kidney area of the lower right abdomen is also located in this area, where pyelonephritis, acute glomerulonephritis and other diseases of the urinary kidney system can cause distension and pain in the lower abdomen and lumbago. Urinary system diseases and cystitis may also present with right lower abdominal distension combined with lumbago. It is advisable to have an ultrasound or plain film of the abdomen to see what the cause is.