Swollen lymph nodes in the neck without fever and headache are considered most likely to be caused by sinusitis, gingivitis, acute mumps and other diseases. 1. Sinusitis: Many sinus infections can be complicated by swollen lymph nodes in the neck, and there will be a significant headache, which is rarely accompanied by fever. 2. Gingivitis: Gingivitis can lead to enlargement of the surrounding lymph nodes, especially suppurative gingivitis, which can also easily lead to gum pain, reflecting to the head, triggering a headache, which may not be accompanied by fever. 3. Acute mumps: headache, swollen lymph nodes are obvious symptoms of mumps, some patients do not have fever. Neck lymph node swelling, no fever, headache may also be caused by other reasons, such as intracranial tumor cervical lymph node metastasis. It is recommended to consult a doctor in time, improve the examination, and follow the doctor’s instructions for treatment after a clear diagnosis.