It is still not clear, but experts in the field of medical science believe that chest pain during COVID-19 could be due to heart injury or lung inflammation. In some cases, the SARS-CoV-2 can enter your cells through a receptor called angiotensin-converting enzyme 2 (ACE2) and can damage your cells and cause inflammation. These receptors are found in several parts of your body including your heart and lungs. Another reason could be the release of molecules called inflammatory cytokines, which may cause damage to heart cells. This phenomenon is called cytokine storm syndrome. This damages the heart muscles, leading to heart-related complications. The complication proceeds faster in those already suffering from heart-related issues.
In case of lung inflammation, inflammatory molecules released into the pleural space (area between layers of the sac that surrounds each of your lungs) can trigger pain receptors and cause chest pain or burning. Some people with COVID-19 also develop pneumonia which involves inflammation of the lungs, leading to chest pain.
Typically, symptoms of the infection develop within 2–14 days of exposure to the coronavirus. Besides, not all cases of chest pain occur due to SARS-CoV-2 infection.