Sudden and severe pain in the waist may be lumbar small joint disorder, kidney stones, lumbar disc herniation, lumbar sprain. 1. Lumbar spine small joint disorder: suddenly change from one position to another position, resulting in lumbar spine dislocation, especially small joint dislocation, synovial embedded edema, stimulation of the surrounding nerve endings, sudden lumbar pain, lumbar spine activity is limited, lumbar dare not move, fixed in a special position, can be clearly diagnosed through the hospital film, the line of orthopedic acupressure reset symptoms can be alleviated. 2. Kidney stones: Kidney stones can cause sudden back pain. In addition to low back pain, there will be abdominal pain, urinary abnormalities, do urinary ultrasound can be clearly diagnosed. Depending on the size of the stone, you can choose methods such as extracorporeal shock wave lithotripsy to reduce the symptoms. 3. Lumbar disc herniation: acute herniation compression of the nerve nerve edema can also appear lumbar sudden pain. 4. Lumbar sprain: lumbar muscle ligament strain will also appear sudden pain. Sudden pain in the lower back generally consider the above situations, in addition to women also need to consider whether there is uterine adnexal disease or ectopic pregnancy, so sudden pain in the lower back to the hospital to check and then further treatment.