Multiple: Multiple common causes include bacterial or viral infection, thrush (fungal), allergy and acid reflux. Other causes may include medication side effects, toxic exposure, local trauma, neurologic and autoimmune conditions.
Answered 6/10/2015
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6 doctors weighed in across 3 answers
A doctor has provided 1 answer
A doctor has provided 1 answer
16 doctors weighed in across 3 answers
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