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This is Dr. David
slight swelling of lymph nodes under the jaw can be from viral infection, cold, mononucleosis viral infection
allergies, throat irritation, post nasal drip, sinus infection, acid reflux, tonsil infection
lymph nodes are part of your body's immune system and they can swell up to help you fight off infections to help keep you healthy.
how old are you?
are you taking any medications?
do you have a doctor you can see who can feel and examine your lymph nodes?