When you wake up in the morning with painful distension in both kidneys, you should pay attention to whether it is caused by stones or lumbar muscle strain. It is recommended that ultrasound examination of the kidneys, ureter and bladder and routine urine examination can make a diagnosis and differential diagnosis. If the ultrasound shows fluid in the kidney and stones in the ureter or kidney, this kind of swelling and pain may be caused by stones. If these tests are normal, the pain may not be due to the kidneys, but to the muscles in the lower back. Pay attention to whether the bed you sleep in is too soft and whether your sleeping posture is not good, all these factors can lead to swelling and pain in the muscles of the low back, and it is recommended to see an orthopedic surgeon, while physical therapy and hot compresses can relieve the symptoms.