Discovering a lump on your neck, behind your ears, or along your jawline can feel unsettling. It’s natural for your mind to jump to the worst-case scenario. But in many cases, these bumps are simply swollen lymph nodes—a sign that your immune system is actively protecting you.

While most causes are harmless and temporary, understanding why lymph nodes swell can help you stay calm and know when to seek medical care.

What Are Lymph Nodes and Why Do They Swell?

Lymph nodes are small, bean-shaped glands located throughout your body—in the neck, armpits, groin, under the jaw, and behind the ears. They act as filters, trapping harmful substances and supporting your body’s defense against infections.

Normally, they’re not noticeable. But when your body is fighting an infection or inflammation, they can become enlarged, tender, or more prominent.

Common Causes of Swollen Lymph Nodes

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