Lymph nodes behind the ear may swell when an individual is experiencing a bacterial, viral, or fungal infection in the ear, throat, or eye. An allergic reaction can also lead to swelling. Infections that specifically affect the lymph nodes behind the ear include:
Fungal infections in or around the head, which can cause scalp itching or hair loss.Bacterial infections, such as tonsillitis or sores in the mouth or gums, necessitating the removal of bacteria by antibodies.Pfeiffer's glandular fever, which can cause prolonged enlargement of the lymph nodes behind the ear.
Additionally, lymph nodes in this region may swell due to sores on the neck. Autoimmune diseases can weaken the immune system, potentially resulting in swollen lymph nodes. Furthermore, certain cancers, such as lymphoma or leukaemia, can manifest as swollen lymph nodes behind the ear, serving as an early warning sign of the disease.