We all have gotten hoarse from time to time for one reason are another. You could have strained it by over working it from singing, laughing a lot, too much talking or yelling and in that case your voice just needs some rest and maybe drinking something warm, to relax the voice box. Now if it’s something more serious like and infection of some type, like laryngitis or even Strep, you definitely will want to get it checked out by your physician. You don’t want it to turn in to Pneumonia. It’s better to be safe then sorry.