Question

why girls are suffering from periods explain

Answer 1

every month the uterus lining gets thicker for fertilisation and if fertilization does not take place it ruptures and starts bleeding thats why girls suffers from period

Answer 2

Bonjour!!

Here's your answer.

$\textbf{Menstrual Cycle :}$
♦ During the period between puberty (from 12-13 years) and menopause (to 45-50 years), the female reproductive system ungergoes a regular monthly sequence of events called $\color{blue}{menstrual \: cycle}$.

♦ If the egg (recieved from the ovary), is not fertilised, the layer known as endometrium of uterus erodes and the unfertilised egg, along with that layer comes out through vagina in the form of blood flow or $\color{blue}{menstrual \: cycle}$.
This is called $\textbf{menstruation}$.

$\textbf{Hope it helps.}$
$\textbf{@charlie16.}$