In women with pain in the left kidney, further relevant examinations are needed to clarify the cause of the pain. Kidney stones: Pain in the left kidney area can occur, mostly accompanied by microscopic or naked eye hematuria, and ultrasound examination of the urinary system is needed to determine whether there are kidney stones. Routine urine tests and ultrasound examination of the urinary system are needed to clarify the presence of pyelonephritis; third, tumors of the kidney or malformations of the kidney: all can produce pain in the left kidney area. Such as repeated kidney and hydrocele, malignant tumor of kidney, malignant tumor of renal pelvis, etc., all may produce pain in the kidney area. CT examination of the urinary system is needed to clarify the presence of malignant tumors; iv. lumbar muscle strain: pain in the kidney area can also occur. The pain is mostly located in the muscles of the lumbar region, and the pain is aggravated when the position changes. For example, the pain increases when bending over, lifting heavy objects at the waist, or strenuous activities. At this time, there is no abnormality in the examination of kidney and urine, so rest and local physical therapy treatment are needed.