Many things: The list of answers to your question is so long it cannot be explained here. Causes range from strep throat or other infection to allergic reaction to swollen lymph nodes or goiter. If the neck swelling causes trouble breathing, that is an emergency. If not, it may not be emergent, but you should probably start by seeing your primary care doctor.
Answered 1/9/2020
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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