Why are swollen lymph nodes a sign of infection?
Swollen lymph nodes are often a sign of infection. This is because when the body is fighting an infection, the lymph nodes work harder to filter out the harmful particles. As a result, they can become inflamed and swollen.
Swollen lymph nodes are most commonly caused by the following infections:
- Colds and flu
- Strep throat
- Tonsillitis
- Ear infections
- Skin infections
- HIV
- Tuberculosis
In some cases, swollen lymph nodes can also be a sign of a more serious medical condition, such as cancer. If you are experiencing swollen lymph nodes that do not go away after a few weeks, it is important to see a doctor to rule out any underlying medical problems.
In addition to infection, there are a few other potential causes of swollen lymph nodes, including:
- Allergies: Swollen lymph nodes can be a symptom of an allergic reaction to something.
- Medications: Certain medications, such as penicillin and sulfa drugs, can cause lymph nodes to swell.
- Autoimmune disorders: Conditions such as lupus and rheumatoid arthritis can cause the lymph nodes to swell.
- _Some cancers - including lymphoma, leukemia, and breast cancer:_ Lymph nodes in any part of the body might be affected when cancer spreads in this way through body channels.