The uvula can be enlarged because of inflammation or a tumor.
Inflammation can be due to infection, allergy, injury or stuck foreign body (fish bone for example). All these conditions cause swelling (edema) of the uvula. Enlargement, caused by inflammation, usually occurs in a short period of time and lasts as long as the factor that provoked it is present.
In he case of a tumor, enlargement is due to cell proliferation. That is usually a slow process that lasts no matter if the factor that provoked it is still present or not.
According to the sudden appearance (one week ago) your uvula swelling could be due to inflammation.
You may want to consult an ENT-specialist about this.
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