What's Wrong with my Mouth?
The most common cause of mouth and throat problems is oropharyngeal candidiasis ("thrush"), a buildup of Candida (a common yeast or fungus). Thrush is easy to diagnose with a mirror and a flashlight. You'll see whitish-yellow curd-like patches, especially on the roof and sides of the mouth, the back of the throat, and the gums. These patches can be easily scraped off. Don't confuse a white coating on the tongue with thrush. The tongue is usually the last part of the mouth to be infected, and a white coating on the tongue, with no other evidence of thrush is usually just ... a white coating on the tongue.