Voice is not clear since a month. There's no pain, no cold/cough. No other uncomforness. Only problem is my voice is not like earlier, it's coming like when we scream loudly then our voice changes, sound not comes out clearly. Same I'm facing now. But I didn't scream. As per my observation my voice keep changing over a month time, as time goes I identified that it's making issue. So kindly suggest what tests need to be done so that I confirm what's my problem is?