What causes low back and leg pain and then butt and legs go numb?

Usually disc. Excruciating pain from the hip down to the ankle can be due to a disc prolaplse causing nerve root pressure or the possiblity of a bony injury producing irritation of the adjoining nerve and or muscle needs to considered. Bursal inflmmation around the hip can also produce these symptoms.

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Wat is itif simeone has lumps on lower back each side of spine and back hurts and legs go numb?

Pinched Nerve. Sounds like you have a pinched nerve in your back. I would suggest seeing a pain/spine specialist to evaluate you further to evaluate what level and what can be done to treat you. There are interventional treatments besides medications and surgeries that might reduce or eliminate the pain altogether. The lumps in the back maybe what are called trigger points where the muscle is spasmed. Read more...