What can cause two swollen lymph nodes in neck?

Infection to tumor: The dx of swollen lymph nodes in neck depends on size, location and symptoms of pain. In upper neck 2 nodes can represent spread of throat infection to ear, spread from parotid gland. In mid neck tumor can arise from metastatic thyroid and in supraclavicular fossa , an upward spread from lungs. Biopsy if persistent or enlarging can show lymphoma, infection or tumor metastatic tumor.