Your Doctor, will ask for a detailed history regarding,

 The symptoms and their duration

 The posture adapted by you in daily life

 Whether the condition is present from birth

 If you suffer from any diseases like osteoporosis or osteoarthritis of spine or infectious disease of the spine like tuberculosis

 If you had a Spinal injury

After gathering your history, the doctor will conduct a physical examination to confirm the deformity. This examination includes

 Observation and palpation of the spinal area. (In kyphosis, the muscles will be tender and on palpation cause pain)

 Looking for the appearance of the curve of the spine, which will be too far outwards, resembling a hunch back, when viewed from the side. (This will confirm the deformity.)

You will probably undergo Other Tests too.

 X-rays: to detect the severity of the curvature of the spine.

 Bone - Scan: to evaluate any degeneration or tumor or infections or fractures of the bones of the spine

 MRI Scan: to detect any damage to the spinal cord, especially if neurological symptoms are present

 CT Scan: to detect abnormalities in the spinal cord like tumors or disc degeneration etc.