More than one million people around the world have been deemed recovered from the coronavirus, but beating the initial sickness may be just the first of many battles for those who have survived.

Some recovered patients report breathlessness, fatigue and body pain months after first becoming infected. Small-scale studies conducted in Hong Kong and Wuhan, China, show that survivors grapple with poorer functioning in their lungs, heart and liver. And that may be the tip of the iceberg.

The coronavirus is now known to attack many parts of the body beyond the respiratory system, causing damage from the eyeballs to the toes, the gut to the kidneys. Patients’ immune systems can go into overdrive to fight off the infection, compounding the damage done.