How common is a neck lump in cancer of unknown primary?

Cancer of unknown primary means cancer has been found, but the place where it started has not yet been identified. A lump in the neck can sometimes be an enlarged lymph node, which may be the first finding that brings someone to medical attention. Infections, inflammation, thyroid conditions, salivary gland problems, and harmless growths can also cause a neck lump. The lump itself does not reveal the cause, so examination and testing guide the next steps.

Arrange a medical appointment for a new neck lump, particularly if it does not go away or is becoming larger. Note where it is, when you first felt it, whether it moves, and any related sore throat, swallowing change, voice change, fever, or dental symptoms. A clinician may examine your mouth, throat, skin, and neck, then discuss imaging or a needle sample if needed. Do not repeatedly press or massage the area, as this can make it harder to judge changes.

Seek urgent care if a neck swelling causes trouble breathing, trouble swallowing saliva, rapidly increasing swelling, or severe pain. Contact a clinician promptly for a firm or enlarging lump, a lump that persists, or a lump accompanied by an unexplained voice change or swallowing difficulty. The need for assessment comes from these features and their progression, not from estimating what the lump might be.

Ask which structures may be involved, whether imaging or a sample is appropriate, and when you should expect results. Ask which new symptoms, such as breathing, swallowing, or voice changes, should prompt you to seek care earlier.