Kidney Yu pain is more common in clinical practice, and there are many common causes, such as kidney disease, bladder disease, and lumbar disease. Kidney Yu belongs to the common acupoints of the foot sun bladder meridian. Massage or acupuncture of Kidney Yu can strengthen the waist and kidneys and is suitable for relieving symptoms such as soreness and weakness of the waist and knees and kidney deficiency and back pain.1. Kidney disease: Kidney Yu pain can be caused by kidney disease, such as kidney stones, urinary tract infection, ureteral stones, etc. When the stone moves to the ureter, it will cause ureteral obstruction, which will lead to obvious contraction due to poor urination, thus causing pain in the kidney yu; 2, bladder disease: kidney yu is an acupuncture point of the bladder meridian, and if there are diseases in the bladder, such as cystitis and bladder stones, it may stimulate the kidney yu and cause discomfort reactions, which can be manifested as pressure pain and soreness in the kidney yu and its surrounding locations; 3, lumbar disease: common Lumbar disc protrusion, if the protruding part presses the nerve and stimulates the kidney yu, it can manifest as kidney yu pain, local pressure pain, soreness, swelling pain, etc., and some patients have severe pain when pressing; 4, other causes: if long-term standing, poor sleeping posture or overexertion, it may lead to lumbar muscle strain, muscle tension and spasm, which will involve the kidney yu and cause pain and discomfort in the kidney yu and surrounding areas. When the weather changes and the patient suddenly gets cold, it may lead to blockage of the meridians and pain in the kidney yu area. If you have pain in the kidney, you should go to the hospital to have the corresponding examination, such as CT or MRI of the lumbar spine, to confirm whether there is a herniated disc, etc. You can also have ultrasound to rule out inflammation of the urinary system and diseases such as kidney stones and ureteral stones.