Swollen lymph nodes might indicate
a. an infection.
b. high blood pressure.
c. varicose veins.
d. an irregular heartbeat

Swollen lymph nodes might indicate A. AN INFECTION.

Lymph nodes are small, bean-shaped glands throughout the body. They are parts of the lymph system which carries fluid, nutrients, and waste materials between the body tissues and the blood stream.

Lymph nodes swell in one location when an injury, infection, or tumor develops in or near the lymph node.

Lymph node glands are found on either side of the neck, under the jaw or behind the ears. They are also found in the armpits, groin, and collarbones.

The answer is constant.