Sometimes when i drink water, it goes up my nose and can even cause a burning sensation. what could cause this and is it serious? im really worried its something bad.

Water up nose: If you drink water while exhaling, your throat tissues close and water will go upwards into the nose. The membrane then secretes its own water to neutralize the other water causing the burning feeling. If this happens to you often there may be a dysfunctional swallowing situation and an Otolaryngologist should evaluate and advise you. You may be sent for a swallowing study.