Boys 18 years old laryngeal knot is not obvious may be because of the thyroid cartilage plate congenital flat, body fat hypertrophy, androgen level is insufficient. 1. congenital flat thyroid cartilage plate: the laryngeal knot is the intersection angle formed above the thyroid cartilage on both sides. If a boy’s thyroid cartilage plate is congenitally flat, the angle formed above the thyroid cartilage on both sides will not be prominent enough, so the laryngeal knot is not obvious. 2. body fat fat: body thicker boys, its neck fat may be prominent throat knot hidden in the subcutaneous fat, manifested in the boys to the age of 18 years old throat knot is still not obvious. 3. Insufficient androgen levels: The laryngeal node is considered a secondary male sexual characteristic, and the development of the laryngeal node needs to be supported by sufficient levels of androgen. When the level of sex hormone is insufficient, the laryngeal nodes cannot develop normally, so even at the age of 18, the laryngeal nodes of boys are still not obvious. Boys who do not have obvious laryngeal nodes at the age of 18 should go to the hospital in time to check the cause of the problem so as to avoid delaying their condition.