If the patient has left kidney acidity, it may be caused by the following reasons, the following specific analysis: 1, lumbar muscle strain or lumbar disc herniation, lumbar muscle strain or lumbar disc herniation can cause the left side of the renal area acidity, distension and pain, etc., the treatment is to give the external poultice, baking electricity, massage and other treatments, after the above treatment, the condition will be relieved very quickly. 2, caused by renal calculi, if the patient has a left kidney stone can also be caused by the stimulation of renal stone. Soreness in the left kidney area is caused by the stimulation of kidney stones, which can be treated with traditional Chinese medicine. 3, caused by kidney cysts, if the patient has cysts in the left kidney, the cysts are too big, which can cause soreness and other symptoms in the left kidney area.