Soreness in the kidney area in the morning, which disappears after activities, may be caused by lumbar muscle strain, kidney lesions, etc. It may also be related to local joint and fascial diseases. 1. Lumbar muscle strain: mainly because of the long time keep the same position at night rest, it may lead to the soreness of lumbar muscles, after getting up in the morning and moving around, the soreness can disappear, usually by avoiding the lumbar strenuous exercise, sedentary, and avoiding the injury of external force, in order to prevent leading to the lumbar muscle further injury. 2. Kidney lesions: such as kidney stones, due to less drinking water at night, and posture for a long time to maintain the lying position, the location of the stones may change, so that the soreness in the renal area in the morning, after the activity, the location of the stones once again changed, making the soreness disappear. If the soreness in the kidney area in the morning and disappears after activity, it may also be related to local joint and fascia diseases. It is recommended to go to the hospital in time, complete the relevant examination under the guidance of the doctor, and actively treat.