The development of adolescent age, generally 9 to 18 years.Some people in the development of young people early and late development of some people, a difference of up to 2078 or even more, which is the problem then?
Sooner or later affect the development of the factors that young people are two-fold: First, the normal factors, and the other is pathological factors.
Normal factors (including genetic, nutrition, lifestyle, emotional and other environmental factors), will enable the beginning of the age of puberty, growth rate, mature age and developmental level attained by the existence of large individual differences.There are differences between men and women of different regions, different ethnic groups there are differences, even in the same conditions, living environment, with gender, with the nation's young people, they change during puberty will not completely the same.According to the survey, the development of young people in tropical areas early and late development of the cold areas, can be a difference of a few years.Cities, more often than young people as early as the development of rural areas, children are often intellectuals were inclined to early development.The reasons for these differences has not yet fully understood.
Pathological factors, including the following three types: ① hypothalamic or gonadal abnormalities, as the central thalamus sick, or testis, ovary tumor length, they can appear as early as the development.Adolescent boys showed pubic hair long ago,, beard, voice changes, testicular increased emission and so on; performance for long hair girls,, breast uplift, such as menstrual.Some-year-old man had, in addition to higher long outside the body, the body no signs of that development, which is later development.The complexity of its causes, may be incapable of reproductive hypothalamic obese or sick, or testis, ovary is too small.② abnormal adrenal gland secretion, excessive secretion of androgen, the girls may be a long beard, masculine; excessive secretion of estrogen, may be male breast development, feminization.③ individual children, the two three-year-old at the start of breast development, and some short-term duration, some may last until puberty.If only changes in the breast, no nipple, areola, as well as other secondary sexual characteristics appear, is not premature, the future menstrual normal process will continue.Such anomalies, the general problem, in order to proceed cautiously and should be to go to the hospital to check.
Editor's Choice: young men and women of the card: secondary sexual characteristics
