Menstrual cramps are caused by the contractions of the muscular walls of the uterus. These contractions are caused by chemicals called prostiglandins which, in turn develop under the influence of the hormones estrogen and progesterone. Teens frequently have varying levels of hormones from one cycle to another. This can cause sometimes more severe cramps from one cycle to another.
Menstrual cramps are caused by the contractions of the muscular
walls of the uterus. These contractions are caused by chemicals
called prostiglandins which, in turn develop under the influence of
the hormones estrogen and progesterone. Teens...
More
Patricia Geraghty answered:Menstrual cramps are caused by the contractions of the muscular walls of the uterus. These contractions are caused by chemicals called prostiglandins which, in turn develop under the influence of the hormones estrogen and progesterone. Teens frequently have varying levels of hormones from one cycle to another. This can cause sometimes more severe cramps from one cycle to another.Menstrual cramps are caused by the contractions of the muscular walls of the uterus. These contractions are caused by chemicals called prostiglandins which, in turn develop under the influence of the hormones estrogen and progesterone. Teens... More