 [ Symptoms ] my 15 year old son is the size of an 8 year old and hasnt grown in 5 years what could be causing this [ Disease ] 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