most likely you are having back pain
due to spinal canal
stenosis or root compression from slipped lumber
disc.spine is design to support posture
of body,mobility and proper weight bearing.heavy weight increase the lordotic curve of lumber spine and unequal weight distribution through pelvis causing accelerated bone loss and stress fracture
,herniates vertebral disc to slip foroward from mechanical pressure,narrowing spinal canal, impinging on nerve roots causing pain(spinal claudication). Management of spinal stenosis is aimed toward symptomatic relief and prevention of neurologic sequelae. Conservative measures, such as pharmacologic therapy(drug like pain killers,gabapentin or pregabalin) and physical therapy(but lumber extention excercise shoud be avoided) provide temporary relief.Surgery is indicated when the signs and symptoms correlate with the radiologic evidence of spinal stenosis and when significant radiculopathy, myelopathy (cervicothoracic), neurogenic claudication (lumbar), or incapacitating pain is present.The choice of surgical procedure is individualized to optimize the outcome.