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Symptoms & General Health

What Does It Mean When Your Lymph Nodes Are Swollen?

Linda Girgis | MD

Medically reviewed by Linda Girgis | MD, Girgis Family Medicine on August 22nd, 2026.

Swollen lymph nodes indicate your immune system is actively fighting an infection or other health condition. These small, bean-shaped structures filter harmful substances and produce infection-fighting white blood cells. When they enlarge, it typically means they're working harder to combat bacteria, viruses, or other threats in your body. Common causes include cold and flu viruses, strep throat, ear infections, and skin wounds. Most swollen lymph nodes return to normal size within 2-3 weeks as your body recovers. However, persistent swelling lasting more than two weeks, nodes larger than one inch, or those accompanied by unexplained weight loss warrant medical evaluation to rule out more serious conditions.

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