The signs of precocious puberty in girls mainly include changes in appearance and secondary sexual characteristics as well as changes in hormone levels in the body. 1. When girls experience precocious puberty, there will be changes in appearance such as breast development and pubic hair growth, as well as an obvious increase in height growth, accompanied by an increase in the size of the ovaries and uterus, and the onset of menstruation. 2. When precocious puberty occurs in girls, if blood tests are taken, the level of sex hormones can be elevated, such as follicle stimulating hormone and luteinizing hormone. As precocious puberty can cause abnormal psychological development and affect the final height of the child, so once found signs of precocious puberty, we should take the child to the pediatrics or endocrinology department of the hospital in order to give appropriate intervention for the cause of the disease in a timely manner.