The symptoms of precocious puberty in boys include the development of secondary sexual characteristics before puberty, rapid growth in height and weight, and premature healing of the epiphysis, resulting in the final height of the affected children often being lower than that of normal people. 1. Development of secondary sexual characteristics: the development of secondary sexual characteristics occurs before the age of 9, which usually manifests as enlargement of testicles and penis, appearance of pubic hair, beard, raised laryngeal nodes, and thickening of voice. 2. Rapid growth in height and weight: the symptoms of precocious puberty in boys also include rapid growth in height and weight. And there is the phenomenon of large bone age and premature epiphyseal closure. 3. Premature epiphyseal closure: premature epiphyseal closure is also a symptom of precocious puberty in boys, resulting in the final height of the child being lower than normal. If the child has symptoms of precocious puberty, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment under the guidance of the doctor.