Longterm effects of COVID-19:

Heart. Imaging tests taken months after recovery have shown lasting damage to the heart muscle, even in people who experienced only mild symptoms.

This may increase the risk of heart failure or other heart complications https://www.mayoclinic.org/diseases-conditions/coronavirus/in-depth/coronavirus-long-term-effects/art-20490351

Brain. Even in young people, COVID-19 can cause strokes, seizures and Guillain-Barre syndrome — a condition that causes temporary paralysis. COVID-19 may also increase the risk of developing Parkinson's disease and Alzheimer's disease.

COVID-19 can make blood cells more likely to clump up and form clots... large clots can cause heart attacks and strokes. Much of the heart damage caused by COVID-19 is believed to stem from very small clots that block tiny blood vessels (capillaries) in the heart muscle.

COVID-19 can weaken blood vessels, which contributes to potentially long-lasting problems with the liver and kidneys.

"The potentially long-lasting problems from COVID-19 make it even more important to reduce the spread of the disease by following precautions such as wearing masks, avoiding crowds and keeping hands clean."