The pain in the right side of the waist when you move to consider lumbar trauma, lumbar spine small joint disorder, lumbar dorsal muscle fasciitis, kidney stones and other reasons. 1. Trauma: after the lumbar region is hit by external force, it may cause the right side of the lumbar region to have localized muscle and soft tissue injury or fracture, which will cause the right side of the lumbar region to have pain when it moves. 2. Disorders of small joints of lumbar vertebrae: lumbar sprain may lead to disorders of small joints on the right side of lumbar vertebrae, and localized lumbar vertebrae will be pressurized, and localized nerves will be pressurized due to the change of body position during the activity, which will lead to obvious pain symptoms. 3. Lumbar dorsal myofasciitis: prolonged overexertion, work, or catching cold in the lumbar region, causing muscle spasm in the right side of the lumbar region, which will cause pain during activities. 4. Kidney stones: the presence of right kidney stones, if the right side of the waist activities, can lead to changes in the location of the stones, causing significant pain, often more serious, accompanied by nausea, vomiting and other symptoms. There are many reasons for the pain in the right side of the waist when you move, if it is difficult to relieve, it is recommended to actively seek medical attention and treatment under the guidance of a physician.