4. Zhang Juncai—7’11 1/4 inches
![](http://theinfong.com/wp-content/uploads/blessedson/2016/12/16/Zhang-Juncai-theinfong.jpg)
Like others on this list, Juncai has gigantism caused by a mutation in his pituitary gland. Juncai played basketball when he was younger, and was so tall, he didn’t even have to reach up to dunk.
He eventually had to give the sport up due to a host of health issues, including osteoporosis and heart disease. Because he is unable to stand up perfectly straight, it’s possible that Juncai’s true height may be more than what is currently listed.
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