What are the causes of swollen lymph glands behind the ear?

Swollen lymph nodes are a sign that your lymphatic system is working to rid your body of the causative agents, and swollen lymph nodes may occur as a result of exposure to bacteria or viruses. What are the causes of swollen lymph nodes behind the ear?

1- Tooth infection

2- HIV infection

3- Otitis media

4- Sinus infections

5- Cold or flu

6- Ear infection

7- Lymphoma

8- Sore throat

9- sebaceous cyst

10- Some types of medicines and the allergic response to those medicines.

11- Lymphadenopathy

12- Dermatitis

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