Can a thin person have a large head , or does he need a smaller equal size head to adapt to his body?

Big Head: Yes, a thin person can have a large head and a large person can have a small head. If your head is unusually big or if it is increasing in size, then you need to be evaluated. The important thing is that you use the head you have been given.:)

Large head: Our head size is more influenced by genetics than it is by our body size. Although as kids we go through a stage of having big heads, later on body and head will seem more proportional.