Just look at his face on that photo. Either they wanted to convey the "freak" image, or he is seriously ill and I believe it's the latter.
Gigantism is usually caused by the problems with pituitary gland. People affected have major mobility and movement co-ordination issues and die relatively young due to the fact that their hearts and skeletal systems can't cope with an abnormal growth rate. He needs to be treated ASAP.