Oral thrush is a fungal infection of the throat, tongue or the lining of the mouth. In bad cases, it can spread down the food pipe. Oral thrush is mostly caused by a fungal yeast called Candida albicans. We all have this yeast in our bodies, and our immune systems keep it in balance with the other bacteria and funguses that live in our bodies. If the balance is upset, the yeast can multiply and produce an infection.
Back to Health A to Z. Oral thrush is usually harmless. It's common in babies and older people with dentures. It can be easily treated with medicines bought from a pharmacy. Babies can pass oral thrush on through breastfeeding. This can cause nipple thrush in mothers.
Cathy Wong is a nutritionist and wellness expert. Benjamin F. Asher, MD, is a board-certified otolaryngologist.
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