I feel a lump on the back of my neck: what should I know?

Lymph nodes can become enlarged while the body responds to an infection near the scalp, throat, ears, or skin. A cyst, inflamed follicle, lipoma, or muscle-related swelling can also feel like a distinct lump. Less commonly, a persistent neck mass can be a presentation of head and neck cancer, lymphoma, thyroid cancer, or cancer of unknown primary. A neck lump is a presentation of these conditions; it does not by itself identify the cause.

Notice whether it is tender, mobile, firm, growing, associated with a skin change, or accompanied by fever, night sweats, unexplained weight loss, hoarseness, or swallowing difficulty.

Arrange an examination with a clinician if the lump is new, remains present, or is changing. Record when you first noticed it, its location, tenderness, and whether it changes during an illness. Do not repeatedly squeeze or massage it. The clinician may examine your mouth, throat, scalp, thyroid area, and lymph-node regions, then decide whether imaging, blood tests, or a sample is appropriate.

Bring a list of medicines and recent infections, dental problems, skin irritation, or injuries. The assessment is guided by the lump’s position and physical features rather than by the presence of a lump alone.

Seek urgent medical help if the swelling makes breathing or swallowing difficult, rapidly enlarges, becomes severely painful, or is accompanied by marked weakness or a high fever. Arrange prompt review for a hard or fixed lump, a lump that keeps growing, or one with persistent hoarseness, drenching night sweats, or unexplained weight loss. A clinician can determine whether specialist assessment or a biopsy is needed.

What features of this lump are reassuring or concerning? Could an infection, cyst, lymph node, or thyroid problem explain it? Do I need imaging or a tissue sample? How soon should it be reassessed if it does not change?