There are "giants" in this world. The NBA is living proof. But most non-NBA members have Pituitary Gigantism, which occurs when the pituitary gland secretes too much Growth Hormone (somatotropin or HGH). This makes the person's growth increase exponentially. If this occurs before the growth plates close in the late teens to early twenties, gigantism occurs; if later in life the person suffers from acromegaly.
The wrestler Andre' the Giant is famous example. He eventually reached 7'4" and 550 pounds.
But a less common form of giantism is Sotos-Dodge Syndrome. This is not related to a pituitary problem or any other glandular dysfunction. It is a genetic disorder where the victim grows, and grows, and grows. It's also often associated the a form of autism, muscle weakness, poor coordination, cognitive dysfunction, and the many orthopedic problems that all giants suffer.
Such is the case with 19-year-old Broc Brown, the world's tallest teenager. He currently stands 7'8" and is still growing. But he lost his Guinness crown when he turned 19 as the tallest teen category is for those 18 and below. He seems to be a pleasant young man dealing with an uncomfortable situation with grace and style. Watch the video and I think you'll agree.
Good luck, Broc.
The Telegraph News: http://www.telegraph.co.uk/news/2016/09/21/worlds-tallest-teenager-with-genetic-disorder-cant-stop-growing/
Wikipedia: Gigantism: https://en.wikipedia.org/wiki/Gigantism
Wikipedia: Sotos Syndrome: https://en.wikipedia.org/wiki/Sotos_syndrome
