Your question asks why you are getting shooting pain from your back down your legs when you sit, but when you are standing and walking, you feel fine.
Pain that shoots down legs, as you have described, may be coming from compression of a nerve or nerve root as it exits the spine, or passes through your hip. The 2 most common conditions for this include a disc herniation, or sciatica.
Based on your age, 38, a disc herniation may be more likely. Most orthopedic experts suggest that disc herniations are more likely to occur between the ages of 35-55. When a disc presses on a nerve as it exits the spine, it can send sharp, shooting pain down the buttocks, and depending on how much pressure the disc is exerting on the nerve, can send down all the way down to your feet.
You mentioned "legs", so I assume you are experiencing the same symptoms on both sides, plus you mentioned you are a driver as a profession. Sitting dramatically increases disc pressure, and a very common complaint when having a disc bulge is pain during sitting, but improvement on standing.
It is highly suggested that you visit your primary healthcare provider for a referral to an orthopedic doctor for an MRI. This can identify if there is a disc herniation, and if it is involved in the pain shooting down your legs.
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