If you’ve noticed that your menstrual cycle is getting shorter, you might wonder if this is a cause for concern. Understanding the reasons behind this change can help alleviate your anxiety. Here we’ll delve into the various factors that could contribute to your menstrual cycle shortening.

Understanding the Menstrual Cycle

Before we address why your menstrual cycle may be getting shorter, it’s essential to understand what a menstrual cycle is and what a ‘normal’ cycle length might look like.

What Is A Menstrual Cycle?

The menstrual cycle is the monthly process in which the body prepares for pregnancy. It involves the ovaries releasing an egg (ovulation) and the uterus thickening its lining (endometrium) to prepare for possible fertilization.

What Is Normal Menstrual Cycle Length?

A woman’s menstrual cycle can range between 24 to 38 days, with the average being about 28 days. However, a process that consistently falls outside this range might warrant attention.

Possible Reasons Your Menstrual Cycle Is Getting Shorter

Numerous factors could potentially lead to your menstrual cycle getting shorter. Some of them are as follows:

  • Age and Perimenopause
  • Changes in Body Weight and Exercise Levels
  • Stress
  • Health conditions
  • Medications and contraceptives

menstrual getting shorter

Age and Perimenopause

One primary reason for a shorter menstrual cycle is age. As women approach menopause, changes in hormone levels can cause periods to become irregular before they stop altogether. This phase, known as perimenopause, can last anywhere from a few months to several years.

The average length of a menstrual cycle shortens with age, with the average cycle length for women aged 20-29 being 28 days and the average cycle length for women aged 40-49 being 26 days. 

Changes in Body Weight and Exercise Levels

Significant changes in body weight, whether gain or loss, can affect your menstrual cycle. Extreme exercise or a lack of physical activity can also cause changes.


Experiencing high levels of stress can alter your menstrual cycle length. The body’s reaction to stress can lead to hormonal imbalances that affect your cycle. In this situation, menstrual suppositories help to manage mood swings.

Health Conditions

Certain health conditions like Polycystic Ovary Syndrome (PCOS) or Primary Ovarian Insufficiency can change your menstrual cycle. Conditions like thyroid disorders or issues with the pituitary gland can also affect cycle length.

Medications and Contraceptives

Certain medications, especially hormonal contraceptives like the birth control pill, can change menstrual cycle length. If you’ve started a new drug and noticed a difference in your cycle, discussing this with your doctor is essential.

Approximately 20-30% of women experience shorter menstrual cycles. 

Lifestyle Factors Affecting Menstrual Cycle Length

Lifestyle can significantly affect the length and regularity of your menstrual cycle.

Diet and Exercise

A balanced diet and regular exercise contribute to overall wellness, including the health of your menstrual cycle. Conversely, sudden changes in weight or extreme exercise routines can disrupt the regularity and length of your periods.

Menstrual Cycle Getting Shorter

Stress and Sleep

High-stress levels and inadequate sleep can cause hormonal imbalances leading to changes in your menstrual cycle. Ensuring you manage stress effectively and get plenty of rest can help maintain a regular cycle.

Medical Conditions and Menstrual Cycle Length

Medical conditions can often be a cause for a shorter menstrual cycle.

PCOS and Thyroid Disorders

Conditions like Polycystic Ovary Syndrome (PCOS) and thyroid disorders can lead to irregular periods, including shortened cycles. If you have been diagnosed with or suspect you have such a condition, it’s important to work with your healthcare provider to manage symptoms.

Primary Ovarian Insufficiency

Primary Ovarian Insufficiency, sometimes called premature ovarian failure, can cause your menstrual cycle to become irregular or stop before age 40. This condition can lead to a shorter menstrual cycle.

Birth Control and Menstrual Cycle Length

Hormonal birth control can significantly affect the length and regularity of your menstrual cycle.

Hormonal Contraceptives

Hormonal contraceptives, such as birth control pills, patches, or intrauterine devices (IUDs), can cause changes in menstrual cycle length. This change is often temporary and normalizes after discontinuing the contraceptive.

Other Medications

Other medications, including certain types of antidepressants or antipsychotics, can also lead to changes in your menstrual cycle. 

When to Seek Medical Attention

While it’s normal for menstrual cycles to vary slightly, significant changes or consistent abnormalities should be addressed with a healthcare professional. Suppose your cycle length is consistently shorter than 24 days. In that case, you’re experiencing heavy or painful periods, or your menstrual cycle is causing you stress or concern, it’s time to seek medical attention.

Frequently Asked Questions

What is Primary Ovarian Insufficiency? 

Primary Ovarian Insufficiency is a condition that can cause your menstrual cycle to become irregular or stop before the age of 40.

Can birth control pills shorten my menstrual cycle? 

Yes, hormonal contraceptives like birth control pills can cause changes in your menstrual cycle length.

Is a shorter menstrual cycle a sign of fertility problems? 

It could be. If your cycle is consistently shorter than 24 days, it could indicate problems with ovulation and should be discussed with a healthcare provider.