What is occurring when lymph nodes become swollen and painful?

What is occurring when lymph nodes become swollen and painful?

• A. The lymph node was injured.
• B. Bacteria, viruses, or tumor cells are multiplying inside the lymph node.
• C. The lymph node is blocked and lymph backs up in the system.
• D. The lymph node is performing its function.

Answer: (B)

Swollen and painful lymph nodes indicate an active immune response inside the node. Lymph nodes are the immune system’s filtering stations where B cells, T cells, and other immune cells multiply when they detect invaders or abnormal cells. If bacteria, viruses, or tumor cells are present and multiplying within the node, it triggers inflammation, increased blood flow, and edema, putting pressure on nerve endings and causing pain. This is why this option best fits the situation. Injury to a lymph node can cause swelling, but it doesn’t typically involve ongoing multiplication of pathogens or tumor cells inside. Blockage of lymph flow leads to fluid buildup (lymphedema) without the same inflammatory pain pattern. Simply performing its normal function isn’t the source of swelling and tenderness.

Swollen and painful lymph nodes indicate an active immune response inside the node. Lymph nodes are the immune system’s filtering stations where B cells, T cells, and other immune cells multiply when they detect invaders or abnormal cells. If bacteria, viruses, or tumor cells are present and multiplying within the node, it triggers inflammation, increased blood flow, and edema, putting pressure on nerve endings and causing pain. This is why this option best fits the situation.

Injury to a lymph node can cause swelling, but it doesn’t typically involve ongoing multiplication of pathogens or tumor cells inside. Blockage of lymph flow leads to fluid buildup (lymphedema) without the same inflammatory pain pattern. Simply performing its normal function isn’t the source of swelling and tenderness.