<s>[INST] My husband has had pain in his abdomen for the past 3 days. He says it feels like pins and needles. When he walks he limps because of tbe pain or when he sits for a long time the pain moves to his back and shoots all the way down to his hamstrings. What could be the cause of this? [/INST] Hi. The typical Pins and needles sensation in the abdomen along with reference to the back and then to the hamstrings can be due to a disc in the spine. Get an MRI of the Spine to find where is the compression, Consult a Neurosurgeon and get operated . </s>