Hello dear and welcome to the medhelp forum. Intervertebral disc is made up of water about 80% making it spongy to enable shock absorption, its primary function. Loss of water with age causes disc dehydration which appears as dark colored on an MRI spine. Dehydrated disc is more prone to herniated, bulge and degenerate. It can begin to shift and compress the sciatic nerve if in the lumbosacral region of spine. This can be very painful with radiation until the legs. You need to consult a neurologist if you have pain and other neurological symptoms, he may prescribe pain medications, physical therapy, steroid injections into the epidural space and some exercise. Try to increase your fluid intake. Surgical decompression would be required with persisiting symptoms of a bulging disc. Best wishes and take care.
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