Why do lymph nodes swell?

Swollen lymph nodes are usually a sign that your immune system is fighting an infection, inflammation, or disease. Some common causes include:

1. Infections: Bacterial or viral infections, such as colds, flu, throat infections, tooth infections, and ear infections.

2. Immune system diseases: Autoimmune diseases, such as lupus or rheumatoid arthritis.

3. Cancer: Types of cancer, such as lymphoma or leukemia, can cause swollen lymph nodes.

4. Medication side effects: Certain medications can also cause swollen lymph nodes.

5. Allergic reactions or inflammation.

To better understand your medical history, I need the answers to the following questions:

1. Where are your lymph nodes swollen (neck, armpit, groin, etc.)?

2. How long has the swelling been present?

3. Do you have any accompanying symptoms such as fever, night sweats, unexplained weight loss or fatigue?

4. Have you had any recent infections or other health problems?

5. Do you take any medications or have any known allergies?

6. Is there any pain or tenderness?

These details will be important for me to better assess your condition.

Be sure to consult a healthcare professional to evaluate and treat your symptoms.

I am not a doctor and this is not a medical diagnosis.