
What Causes Swelling And Tenderness In The Left Side Of Throat?

It needs investigation
Detailed Answer:
Hello,
first of all, you should be concerned. I can't say what it is but I can give you a small list of common causes. It has to be investigated because some of the causes can be serious.
It could be an infection. Tenderness usually points to an infection. This is usually the best possibility because infections are treatable. The kind of infection cannot be estimated with the available data only. 6 weeks of progressive swelling and tenderness is a lot of time for common infections, so careful clinical examination is warranted to clarify the picture.
It could be an enlarged (and inflammed) salivary gland. This is usually accompanied by discomfort when eating or tasting sour food like lemon, orange juice etc.
It could be related to a tumor, either cancer or hematologic malignancies. This again has to be clinically examined first to get a good impression of its nature.
And it could be caused by immunological diseases although this would be much rarer as a first sign of such diseases.
So in conclusion, while the most common causes are usually benign and treatable, investigation is warranted. Your primary care doctor should be the right doctor to start from. Ultrasound scan and blood tests might be needed along with other testing depending on the clinical findings.
I hope I've helped, although I could not give you a very specific answer without clinical examination.
Contact me again, if you'd like more information.
Kind Regards!

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