Physiological changes during puberty include the development of the first sexual sign, the appearance of the second sexual sign, and accelerated growth. 1. Development of primary sexual characteristics: the reproductive organs change from infantile to adult, but their functions are not yet perfect. 2. Emergence of secondary sexual characteristics: These include breast development, distribution of pubic and axillary hair, and the formation of a unique female body shape. In males, secondary sexual characteristics appear later than in females, including taller physique, prominent laryngeal nodes, low voice, and the appearance of whiskers on the lips. 3. Accelerated growth: Boys can grow 10 to 12 centimeters during this period; girls can grow 9 to 10 centimeters. Influenced by genetic and nutritional factors, the development of individual bodies varies, and you can choose whether to seek medical treatment according to whether there are any abnormalities in your body.