If there is a bone protruding from the right side of the lower back and it hurts, it may be due to acute trauma, space-occupying lesions, or muscle spasms, among other causes. The specific causes are as follows: 1. Acute trauma: such patients may have acute sprain and contusion of the lumbar spine, direct violent blows to the lumbar region or fall from a height. This may lead to lumbar transverse process fracture or even lumbar dislocation and other traumas. The above lesions will lead to abnormal localized bony bumps and cause obvious pressure pain. 2. Occupying lesions: Some patients may have occupying lesions in the lumbar spine, such as bone tumors. This type of lesion will not only cause the deformity mentioned above, but also compress the surrounding structures, which may lead to localized pressure and pain. 3. Muscle spasm: These patients may have muscle spasm in the lumbar region due to cold or lumbar sprain. After that, the patient will have localized pressure pain. Because of the relatively high hardness of the spasmed muscle, the patient may mistake it for a localized bone mass. It is recommended that the patient should not move the waist when there are many reasons for the above symptoms, and go to the orthopedic department as soon as possible to clarify the cause of the disease and follow the doctor’s instructions.