question: I know someone is has just recently started getting a bad headache with a quick onset and when he gets them, his legs go numb and just give out. He has fallen once or twice because of this. He has seen his IM doctor and now is going for an MRI - they are looking at his pituitary gland. Can a sudden onset of a headache cause his leg numbness and weakness? His headaches do not last more that 10 - 15 minutes.