Hi Kumar, Welcome to HealthcareMagic Forum.
Does he have any bend in his spinal column? It is called Pott's Disease which is the Infection of Spinal Vertebrae with the Mycobacterium Tuberculosis
Bacteria which may be secondary to an extraspinal source of infection. It is a combination of osteomyelitis
that usually involves more than one vertebra. Get him examined by a Orthopedist so that he can examine him and rule out the exact cause by running few tests on him. Once confirmed he will be required to take anti TB medications for 3 months to 6 months to 1 year depending upon the severity of the infection. He has to complete the full course as there will be chances of relapse with much more severity causing neurological complications, which may require surgery then. He needs to go for regular follow up.
Let him get adequate rest and eat healthy nutritious balanced diet which should include fresh fruits and green leafy vegetables. And avoid stress
I Wish him Good Health.