Coincidence?

So I'm watching the House marathon on USA yesterday afternoon and it seems on just about every case they ordered a lumbar puncture--and all were done 'blind' with multiple sticks which appeared to result in excruciating pain (like the doc had told me)--so I was very thankful mine was needle-guided. MS came up in at least three episodes (to later be ruled out). One thing I did note is how many different things share symptoms.