Your all Ectomorph probably, you find it hard to put on weight. I wouldn't worry too much but go to do the doctors. Try to bulk up as well.
Yeah just like Fate said, ask you're local doctor.
I went to my doctor today and he tested multiple things (including taking another blood sample. I was not happy about that part (phobia of being impaled)).
My last thyroid check came back ok but he's going to check again to be sure. I'm in the 95th percentile for my height and 5th percentile for my weight.
He says he does not think he should check for a tapeworm until we've eliminated other things such as a ridiculously high metabolism.
My Wieght Is 52 kg And I Am !4 years old.