The average gap between periods starting (the menstrual cycle) is 28 days. It can sometimes be a bit shorter or longer. A woman's periods are irregular if the gap between them is less than 21 days or more than 35 days. Irregular periods can affect anyone who has periods.
Many things can cause irregular periods. Changes in your body's level of the hormones estrogen and progesterone can disrupt the normal pattern. Irregular menstruation can have causes that aren't due to underlying disease. Examples include family history of irregular menstruation, menopause or menarche, physical stress, psychological stress, smoking or medication side effects.
The treatment for irregular periods depends on the actual cause.
Irregular Menstruation Experts in Maharaja Agrasen Hospital