Knowing the cause of swollen lymph nodes is important for treating them. Your lymph nodes filter harmful substances from your body and help fight infections. Allergens can trigger your immune ...

Discover how allergies can cause swollen lymph nodes, and learn to distinguish between normal immune responses and warning signs that require medical attention.

For example, lymph nodes behind or under the ears may swell when a person has an ear infection ... person has cancer or a severe infection, they may have many swollen lymph nodes.

Lymph nodes are part of the body’s immune system. A swollen lymph node in the armpit may be a sign of a bacterial or viral infection, an injury, or a serious health condition, such as cancer.

While the swelling may be directly related to HIV, particularly in the early stages, it can also be a result of both HIV- and non-HIV-associated infections ... Swollen lymph nodes may or may ...

They are usually small and can only be felt in certain areas such as: Lymph nodes can become enlarged (swollen) for different reasons. The most common reason is when you have an infection. For example ...

A lump behind the ear can have many possible causes. The most common include swollen lymph nodes caused by an uncomplicated infection. These lumps are typically harmless and relatively easy to treat.

Symptoms like fatigue, frequent infections, swollen lymph nodes, and unexplained weight loss often appear gradually—or not at all. Many patients are diagnosed accidentally during routine blood ...

This symptom could be easily dismissed as a sign of a cold or the flu but it could signal something far more serious.

In an interview with Fox News' Sean Hannity, Health and Human Services Secretary Robert F. Kennedy Jr. made several ...