The specific site of pain in the renal region is in the posterior lumbar region, between the lateral edge of the erector spinae muscle and the angle of the 12th rib, and the nature of the pain can be soreness, colic, vague pain, and distension, etc. Soreness refers to the weakness and tenderness of the muscles in the posterior lumbar region, and continuous muscle tension, while colic is similar to a foreign body in the body, and vague pain means that the pain is not intense, but the pain point is fixed and does not increase when pressed. The hidden pain means that the pain is not severe, but the pain point is fixed and does not increase when pressed, while the distension is usually a slight dull pain when swelling.