### Human:\nmy 15 year old son is the size of an 8 year old and hasnt grown in 5 years. what could be causing this?\n\n### Assistant: it could be genetic if his parents are small or he could have a growth hormone deficiency. the sooner the gets evaluated the better. get his in to see a pediatric endocrinologist asap since he is 15 now. growth hormone deficiencies must be treated before his growth plates close (while he is still growing).