A person should be 7 feet (2.20 meters) tall or more to be considered a giant. Gigantism is a disorder and the medical reason for gigantism is a surplus of growth hormone.
Here’s a chart visualising the tallest people in the World.
The exact numbers change from year to year.
Robert Wadlow died from an infection in his leg, caused by a badly fitted brace that helped him walk.
The tallest person in the world alive is the Turkish man Sultan Kösen. He is 251 cm or 8 feet 3 inches tall.