Puberty is the time when your body grows from a child's to an adult's. During puberty, children's external genitalia begin development and show secondary sex characteristics. The normal age of puberty is between 7 and 13 for girls and 9 and 15 for boys. Some adolescents do not start their sexual development at the usual age. They do not show any signs of body changes. This is called<unk> . The delay in some cases represents a normal variation, but other causes are some kind of diseases, such as diabetes, inflammatory bowel disease, kidney disease, cystic fibrosis, mumps, anemia, and genetic diseases. Tests such as hormone level tests and bone age X-ray test, even cranial CT or MRI and chromosomal analysis may help find the causes of<unk> . Treatment and prognosis of<unk>  depend on the cause.
Delayed puberty
Pubertal delay
Precocious puberty
Hyperprolactinemia
Hyperandrogenism
Hypogonadism
Constitutional delay of puberty
Short stature