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Hello and thank you for your question. By sciatica do you mean the tingling and weakness in the hands?
Thank you. Tingling and weakness in hands and fingers is most often related to carpal tunnel syndrome which is a compression of the median nerve as it travels through the wrist. If that is the case wearing cock-up splints (can buy over the counter at any pharmacy) , especially at night may be helpful. also NSAIDs such as ibuprofen may help as well. It would be wise to see a neurologist to have nerve conduction/EMG studies to confirm the diagnosis and the doctor may also order imaging tests such as an MRI of the neck. For the back and leg problem a nerve conduction test may also be helpful and also an MRI of the lower back to look for evidence of a herniated disk or something similar. The doctor may also order blood tests to look at your thyroid function. An underactive thyroid can predispose to carpal tunnel syndrome.
NSAID medication may also help relieve the leg and back pain as well.
The hands and back problems are most likely not related, but the doctor will help determine that with more certainty
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