Armpit Swelling After COVID-19 Vaccine May Mimic Breast Cancer

February 26, 2021

(Medscape) – Axillary adenopathy, or swelling under the armpit, has been reported by women after receiving the Pfizer-BioNTech and Moderna COVID-19 vaccines, but it is also a common symptom for breast cancer. Hence, clinicians should consider recent COVID-19 vaccination history in the differential diagnosis of patients who present with unilateral axillary adenopathy, according to a new article.