A lump on your neck can result from a viral infection or a benign growth. But sometimes it may indicate an underlying condition.

A lump on the neck is also called a neck mass. Neck lumps or masses can be large and visible, or they can be very small. Most neck lumps aren’t harmful. Most are also benign, or noncancerous. But a neck lump can also be a sign of a serious condition, such as an infection or a cancerous growth.

If you have a neck lump, your healthcare provider should evaluate it promptly. See your healthcare provider right away if you have an unexplained neck mass.

Common underlying causes of neck lumps
An enlarged lymph node is the most common cause of a neck lump. Lymph nodes contain cells that help your body fight off infections and attack malignant cells, or cancer. When you’re sick, your lymph nodes can become enlarged to help fight the infection. Other common causes of enlarged lymph nodes include:

ear infections

sinus infections

tonsillitis

strep throat

dental infections

bacterial infections of the scalp