There are many reasons for a bout of pain in the right waist, mainly related to excessive exercise, muscle strain, lumbar disc herniation. 1. Excessive exercise: long-term non-exercise suddenly lumbar excessive exercise and exercise after not fully stretched, will lead to the accumulation of lactic acid, resulting in the phenomenon of lumbar soreness, generally can be relieved after rest. 2. Muscle strains: when a sudden external force leads to muscle strains, lumbar pain can also occur. 3. Lumbar disc herniation: when the lumbar disc herniation compresses the nerves, the phenomenon of lumbar pain and numbness will also occur. The right waist of a burst of pain may also have other reasons, such as osteoporosis, lumbar spinal stenosis, gynecological inflammation, gastrointestinal diseases, urinary stones, etc., if the rest does not relieve, it is recommended to consult a doctor in a timely manner, improve the relevant examination, to clarify the cause of the disease, and then comply with the instructions of the doctor to carry out targeted treatment and treatment, in order to avoid delaying the condition.