If you have COVID-19, the illness that comes from infection with the recently discovered coronavirus, your symptoms may be relatively mild and manageable at home. That’s true for most people. But if you’re older or have another illness such as diabetes or heart disease, you’re more at risk for the serious form of COVID-19.
Some people — about 1 in 6 — will have complications, including some that are life-threatening. Many of these complications may be caused by a condition known as cytokine release syndrome or a cytokine storm. This is when an infection triggers your immune system to flood your bloodstream with inflammatory proteins called cytokines. They can kill tissue and damage your organs, including your lungs, heart, and kidneys.
For More Information: https://www.webmd.com/lung/coronavirus-complications#1