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COVID-19 pandemic caused a major crisis, affecting and straining health care systems, including some very advanced ones. The pandemic may have also indirectly affected access to health care for patients with other conditions, not related to COVID-19, even in countries not overwhelmed by an outbreak.We analyzed and compared visits to the emergency room (ER) department during the same calendar period of 2019 and 2020 (from March 1 to March 31 of each year) in our hospital, a medium size, tertiary center, located in the center of Athens, which is not a referral center for COVID-19.Total ER visits were reduced by 42.3% and the number of those requiring hospitalization by 34.8%. This reduction was driven by lower numbers of visits for low risk, non-specific symptoms and causes. However, there was a significant decrease in admissions for cardiovascular symptoms and complications (chest pain of cardiac origin, acute coronary syndromes, and stroke) by 39.7% and for suspected or confirmed GI hemorrhage by 54.7%. Importantly, number of ER visits for infections remained unchanged, as well as the number of patients that required hospitalization for infection management; only few patients were diagnosed with COVID-19.During the initial period of the pandemic and lock-down in Greece, there was a major decrease in the patients visiting ER department, including decrease in the numbers of admissions for cardiovascular symptoms and complications. These observations may have implications for the management of non-COVID-19 diseases during the pandemic.