Dear Customer (name blocked for privacy),
Process of elimination here.....swollen gland (aka lymph node.) If it is a swollen gland, you may be able to palpate it. It may feel tender. Swollen glands are a response to the body's attempt to fight off an infection. Usually other signs of infection are present when you have swollen glands such as fever, fatigue, sore throat, etc.
Another possibility could simply be a strained muscle. In this case, you would notice increased or agitated pain with movement of the neck (side to side, up and down, etc.) In this case, ibuprofen can help the discomfort along with a good chiropractor or massage therapist if pain persists. Warm compress may also provide some relief.
If the above two do not seem to apply to you, you may want to be examined by an oral and maxillofacial surgeon. He/she may order an MRI of the temporomandibular joint. (TMJ) The pain related to TMJ is similar to your symptoms.
Your question about stress worsening it? Absolutely. Especially if it is muscular or TMJ as it causes strain on the already uncomfortable area. Avoid grinding teeth or tensing up your neck and jaw.
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