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Previous studies reported axillary lymphadenopathy (LAP) as a side effect of the anti‐COVID‐19 vaccine. However, the effects of nonsteroidal anti‐inflammatory drug (NSAID)s on mRNA COVID‐19 vaccine‐related LAP have not been investigated.

We aimed to investigate the effects of NSAIDs on temporal changes in sonographic findings of COVID‐19 vaccine‐associated LAP.

Our single‐center retrospective cohort study was conducted between October 2021 and April 2022. We included patients (aged ≥ 18 years) who applied with complaints of swelling in the ipsilateral axillary region after the COVID‐19 vaccine and had axillary region ultrasound (US) scans in electronic medical records within 30 days pre‐vaccination. The serial US was performed on the third, 10th, and 30th days post‐vaccination.

Our study included 38 patients with a median age of 36 (IQR, 32 …