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He should be taking pain killer, muscle relaxants, avoid lifting weighs and take adequate rest for 6 weeks after Surgery. If there is still pain he may need to get examined by the Surgeon to look for any nerve
compression. Kindly take him to the surgeon if his symptoms are not getting relieved with the medicines. Let him eat plenty of fresh fruits and green leafy vegetables and diet with good protein like cereals, pulses. Let him avoid bending forwards much.