Precocious puberty in boys is mainly manifested in the development of secondary sexual characteristics, such as the increase of hair, the appearance of the laryngeal knot, the development of sexual organs and other characteristics. 1. Increased hair: due to the stimulation of androgens, the hair increases, mainly in the arms, thighs, armpits, beard and other parts of the hair growth. 2. Throat knot: the more obvious symptom of precocious boys lies in the throat knot, also because the body is affected by androgens, resulting in the protrusion of the throat knot, the voice will also be prone to change, will become more low. 3. Sexual organ development: prematurely mature boys’ sexual organs develop prematurely, accompanied by the performance of spermatorrhea. There are many causes of precocious puberty in boys, precocious puberty will prematurely appear epiphyseal closure, short stature, when you find that your child has precocious puberty phenomenon, parents should pay attention to timely take your child to the regular hospital for medical treatment, in the guidance of a professional doctor to control early, in order to avoid affecting the physical and mental health of the child.