The first menarche of a 12-year-old girl may have signs such as abdominal cramps, breast swelling and pain, and increased vaginal discharge, but there are individual differences.
1. Abdominal pain: 12-year-old girls may have abdominal cramps and swelling before the first menarche, mainly due to the increase in prostaglandins before menstruation, resulting in abdominal swelling and pain.
2. Breast swelling and pain: women will have progesterone rise after ovulation, progesterone may lead to breast physiological hyperplasia, resulting in breast swelling and pain.
3. Increased vaginal discharge: before the onset of menstruation there may be pulling clear white tape appears, the amount of small, occasionally with blood and other symptoms.
There may be other signs and symptoms of the first menarche in a 12-year-old girl, and there is individual variability. Consultation with a medical professional is recommended.