Lateral back pain thigh cramps may be caused by lumbar disc herniation, osteoporosis, hypocalcemia and other diseases. It is necessary to consult a doctor in time to find out the cause. 1. Lumbar disc herniation: If the patient suffers from lumbar disc herniation, the nucleus pulposus protrudes from the annulus fibrosus, causing nerve compression symptoms. Then there will be lumbar side pain thigh cramps, usually accompanied by lower limb numbness. 2. Osteoporosis: mostly occurs in middle-aged and old people. With age, middle-aged and elderly people gradually reduce the amount of bone. Usually, they will feel sick all over the body, and may also experience pain in the side of the waist and cramps in the thighs. You should go to the hospital for a bone density test in time. 3. Hypocalcemia: refers to a decrease in blood calcium concentration due to various reasons, which can be manifested as neurological abnormalities, such as numbness of fingers and toes, muscle stiffness, lumbar side pain, thigh cramps, and so on, and can also be manifested as systemic symptoms, such as chest tightness, diarrhea, and so on. Lower back side pain and thigh cramps may also be caused by other factors, and should be timely medical examination and treatment. Usually should develop good habits, do not stand for a long time, sit for a long time.