Menstruation is part of the menstrual cycle in which the lining of the uterus called endometrium is shed, appears as bleeding that is released through the woman’s private part.
Menstruation starts during puberty, between ages of 10 and 16 years and will continue until menopause.
Oligomenorrhea or irregular periods happens when there is a change in contraception method, a hormone imbalance, hormonal changes around the time of the menopause, and endurance exercises, and chronic medical issues, according to Medical News Today.
It is normal to have irregular periods for the first few years of menstruating. But irregular cycle means that the interval between periods varies each month, sometimes they come every 28 days, sometimes every 20, sometimes every 30.
Below is the list of most common causes of irregular periods:
1.Eating disorders, like anorexia and bulimia
2. Excessive weight gain or weight loss; extreme thinness and obesity both cause your menstrual cycle to become irregular or even to disappear
3. Stress or emotional problemsHormonal problems, for example, when the thyroid malfunctions
5. Over-exercising: If you’re an athlete and train very hard, you may stop menstruating because your body wants to survive and save energy and menstruation requires energy
6. . Problems with the pelvic organs (such as polycystic ovarian syndrome, for example)
7. Drugs like birth-control pills can affect the frequency and/or intensity of menstruation
In case you want to have s*x and avoid getting pregnant, make sure to use birth control method especially when you have an irregular period.
Source: Health Miracle Pedia