3 doctors weighed in:

Can allergies cause a swollen lymph node? I had one behind my left ear. But it comes and goes...

3 doctors weighed in
Dr. Michael Miller
Wound care
1 doctor agrees

In brief: Monitoring Centers

Lymphatic system absorbs/carries things too big to go into the arteries/veins like bacteria eaten by white cells/digested food.
Lymph nodes "taste" the lymph everywhere for bad stuff like bacteria/viruses/cancers, etc. When it detects a problem, it alerts the immune system and your body reacts. They enlarge in response to the inflammation they create when they react. They shrink when all is well.

In brief: Monitoring Centers

Lymphatic system absorbs/carries things too big to go into the arteries/veins like bacteria eaten by white cells/digested food.
Lymph nodes "taste" the lymph everywhere for bad stuff like bacteria/viruses/cancers, etc. When it detects a problem, it alerts the immune system and your body reacts. They enlarge in response to the inflammation they create when they react. They shrink when all is well.
Dr. Michael Miller
Dr. Michael Miller
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Dr. Jeffrey Rosch
Internal Medicine - Allergy & Immunology

In brief: Doing their job

Allergy is an unlikely cause of a swollen lymph node.
Lymph node swelling is the result of a local infection or irritation and occasionally cancer. They are very common where you describe, the post auricular lymph chain and since it comes and goes very unlikely to be bad. It's most likely doing it's job of limiting and fighting a localized viral or bacterial infection or irrit (uri, ear, or scalp).

In brief: Doing their job

Allergy is an unlikely cause of a swollen lymph node.
Lymph node swelling is the result of a local infection or irritation and occasionally cancer. They are very common where you describe, the post auricular lymph chain and since it comes and goes very unlikely to be bad. It's most likely doing it's job of limiting and fighting a localized viral or bacterial infection or irrit (uri, ear, or scalp).
Dr. Jeffrey Rosch
Dr. Jeffrey Rosch
Thank
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