<s>[INST] This is the 3rd time that i start having pain in lower back, then the legs, numbness then proceeds to leg paralysis with no feeling when feet are pricked with needles.  It usually lasts for 3 4 days.  Doctors have not found anything with numerous testsa [/INST] If there  is  temporary paralysis  along with  numbness  and loss  of  sensations,  the  cause  may  be  neuro-vascular  and  MRI  of spine is  indicated  and  also  other  tests  to  evaluate  vascular  abnormalities in  the  region. Transcient  ischemic (loss of  blood  supply) episodes  point to  some  compression  in  the  area </s>