This question already has an answer here:
I feel horrible because I know my coworker can't help it, but I'm going crazy... I think he has a hearing problem so I am uncomfortable saying anything to him. Sometimes he burps loudly, but I'm not sure if he really knows how loud it is... He violently shakes his legs and our desks are right next to each other. If he has some sort of condition, the last thing I want to do is say anything, but how do I go about telling my boss that I would like to be moved away from him? It is horribly distracting and it makes me want to pull my hair out.