The symptoms as mentioned in your post can be attributed to musculo-skeletal injury.
Symptomatic relief can be obtained with ice application, intake of anti inflammatory preparations like Ibuprofen
, & application of analgesic+muscle relaxant
Multivitamins & multimineral preparations also need to be added in his diet.
If symptoms still persist, kindly consult an Orthopedician for proper clinical examination.
Investigations like X ray & MRI of the lumbo sacral spine will be helpful in detecting any fracture
, soft tissue injury
or other pathological cause for the symptoms.
Wishing your brother a good health.