What Is Behind Long COVID? It Could Start with Blood Clotting Issues Written by George Citroner on August 19, 2021 — Fact checked by Dana K. Cassell New research finds a significant association between signs of blood clotting and symptoms of long COVID. Morsa Images/Getty Images A new study finds that long-haul COVID-19, commonly referred to as “long COVID,” may be related to blood clotting issues. In the study, 50 people were reviewed for an average of 68 days after developing COVID-19. They found people with higher blood clotting markers were more likely to have long COVID symptoms. While most people with COVID-19 get better within weeks, some people experience post-COVID-19 conditions that are commonly dubbed “long COVID” or long-haul COVID-19. Post-COVID-19 conditions are a wide range of new, returning, or ongoing health problems that may be experienced 4 or more weeks after getting COVID-19, according to the Centers for Disease Control and Prevention (CDC)Trusted Source. Researche...