Coughing up blood (hemoptysis) is a very rare symptom of COVID-19. About 1% to 5% of people with COVID-19 experience this symptom. It’s most common if your infection leads to pneumonia or if you have a pulmonary embolism at the same time, per 2020 research.
Hemoptysis can be a medical emergency. If you cough up more than a teaspoon of blood, consider connecting with a healthcare professional as soon as possible.