What is the cause of a swollen lymph node under my chin? it is not painful, however , sometimes it gets aggravated by swallowing. is this worrisome?

Salivary gland: Could this be a salivary gland the is worsening when eating and swallowing , lymph node should not be painful with simply swallowing.

Probably not: Lymph nodes enlarge in response to inflammation since they are designed to help fight this. The oral cavity is a major source of minor inflammation/infection and a swollen lymph node is not surprising. If it remains small, is soft and non-tender, and you have no other symptoms it should resolve. If not, have it seen by your family doctor or an ent.