(NewsNation) — More than 30 million Americans are believed to have long COVID, a little-known, little-studied aftereffect of the COVID-19 virus, according to NewsNation’s Chris Cuomo.

Dr. William Li said studies on long COVID have shown an increased risk for diabetes in children, heart problems for middle-aged people and anxiety, among other symptoms, including onset Alzheimer’s Disease for people over 65.

“This is a mysterious condition that is up to more than 100 different symptoms, we don’t even have a good definition of it,” Li said on NewsNation’s “CUOMO.” “However, it qualifies you for the American Disabilities Act, so it is disabling.”

Li’s full interview can be viewed in the video above.