COVID-19 causes heart problems that range from irregular heartbeats to angina. It also worsens pre-existing cardiovascular conditions, according to an analysis and UPI. Just over 14% of people hospitalized due to infection with the new coronavirus... ...Have developed heart complications due to the disease, the researchers said. That's in addition to the nearly 13% of those hospitalized who had pre-existing heart conditions. Roughly 10% of those with heart conditions who were infected have died.