The physiological location of the right lower abdomen is mainly the intestine or appendix, and also the kidney area is also behind the right lower abdomen. If symptoms of vague pain and lumbar acidity in the right lower abdomen occur, first, consider whether they are caused by gastrointestinal problems, such as gastrointestinal inflammation, enteritis or irritable bowel syndrome, which can cause vague pain, lumbar acidity and farting in the lower abdomen. Because the intestinal peristalsis increases, it can cause such symptoms. The second one, appendicitis. The vague pain in the right lower abdomen, if the inflammation is not that severe, may be vague pain, and then severe pain or symptoms of lumbar acidity and farting are also possible. The third one, the kidney is also in the back of the lower right abdomen, and certain diseases of the kidney can also present with symptoms of lumbar acidity.