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The menstrual cycle is a complex physiological process characterized by regular hormonal changes. A menstrual cycle is generally considered normal if it occurs every 21 to 35 days, menstrual bleeding lasts 3 to 8 days, and the cycle remains relatively regular from month to month.

The first menstrual period, known as menarche, usually begins between the ages of 8 and 13. Following puberty, most women develop a regular menstrual cycle.

What Is an Irregular Menstrual Cycle?

Your menstrual cycle may be considered irregular if the length of your periods or the interval between cycles changes consistently from one month to another.

What Can Cause an Irregular Menstrual Cycle?

Common causes include:

• Puberty – menstrual cycles may remain irregular for the first 1–2 years after menarche.
• Perimenopause – the transitional period before menopause, typically between 45 and 55 years of age.
• Early pregnancy (take a pregnancy test to rule out this possibility).
• Certain types of hormonal contraception.
• Significant weight loss or weight gain.
• Eating disorders, such as bulimia or anorexia.
• Excessive physical exercise, intense training, or emotional stress.
• Polycystic Ovary Syndrome (PCOS).
• Asherman's syndrome, a condition characterized by scar tissue formation inside the uterus or cervix.
• Thyroid disorders.

To determine whether your menstrual cycle is irregular, it is recommended to keep a menstrual calendar, recording the first day of each period and the duration of menstrual bleeding.

When Should You See a Doctor?

You should consult a healthcare provider if:

• Your menstrual cycle suddenly becomes irregular and you are under the age of 45 (i.e., you are unlikely to be in the perimenopausal period).
• Your period occurs less than 21 days or more than 35 days after the start of your previous menstrual period.
• Your menstrual bleeding lasts longer than 8 days.
• You have an irregular menstrual cycle and are planning to become pregnant.
• You have a gynecological or endocrine condition that may affect the regularity of your menstrual cycle.

Treatment

Treatment should always be individualized and based on the underlying cause of the irregular menstrual cycle.

Irregular menstrual cycles that occur during puberty are usually considered normal and, in most cases, do not require treatment.