The most common reason would be infection. Given the current pandemic situation, it still most likely was Covid. It is not clear from your question whether you had a single Covid test or multiple. If your Covid test was done too early or too late, it could have been negative despite having had Covid.
Answered 12/23/2021
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If you experience these symptoms for more than one month, an ENT examination is recommended. I agree that sinusitis and COVID-19 are most likely, even with a negative test.
Answered 12/23/2021
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6 doctors weighed in across 2 answers
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