Back pain on its own most likely due to problems in the spine. Back pain with leg pain might be due to nerve compression from spinal cord due to various reasonssuch as disc prolapse etc.
Drinking water is essential to prevent dehydration. Dehydrated disc ismoreproneto injury.
Rest is essentialto get more hydration for disc.If disc height decreases due to dehydration then it can cause more strain to other structures in the back such as facet joint ,ligaments,etc.
Bend with your hips and knees rather than with spine. When lifting weight do it with close to the body.
Back pain with leg pain-it is better to get MRIscan to see any disc prolapse. back pain in elderly, children, back pain with fever, back pain with loss of weight and loss of appetite, back pain withand history of cancer need to get MRI to confirm there is noother pathology.
Main treatment is physiotherapy. Pain killers and muscle relaxants are helpful in acute phase.Once pain is controlled better to get back muscle strengthening exercises.
You need to see orthopaedic doctor. Hewill asses youand probably get MRI scan done. Depends on the findings treatment options includes traction with physio,painkillers. He maysuggest nerve root block (which is injection around nerve root with steroid under X ray control).surgery may beavoided if nerve root block work.
Back pain on its own can be controlled with physio and exercise. Drink plenty of water.