14 irregular period causes and how to identify them

What causes irregular periods?

Your menstrual cycle is counted from the first day of your last period to the start of your next period. Your period is considered irregular if it’s longer than 38 days or if the duration varies.

Irregular periods can have several causes, from hormonal imbalances to other underlying conditions, and should be evaluated by your doctor. Here’s a look at the possible causes and their symptoms.

1. Pregnancy

Pregnancy can cause you to miss your period or experience spotting. Other symptoms of early pregnancy may include:

• morning sickness
• nausea
• sensitivity to smells
• breast tingling or tenderness
• fatigue

If you miss a period or notice changes in your period and you’ve had sex, you can take a pregnancy test at home or see your doctor to find out if you’re pregnant.

If you may be pregnant and experience sharp, stabbing pain in the pelvis or abdomen that lasts more than a few minutes, see your doctor right away to rule out ectopic pregnancy or miscarriage.

2. Hormonal birth control

Hormonal birth control pills and hormone-containing intrauterine devices (IUDs) can cause irregular bleeding.

Birth control pills may cause spotting between periods and result in much lighter periods.

An IUD may cause heavy bleeding.

3. Breastfeeding

Prolactin is a hormone that’s responsible for breast milk production. Prolactin suppresses your reproductive hormones resulting in very light periods or no period at all while you’re breastfeeding.

Your periods should return shortly after you stop breastfeeding. Read on to learn more the effects of breastfeeding on your period.

4. Perimenopause

Perimenopause is the transition phase before you enter menopause. It usually begins in your 40s, but can occur earlier.

You may experience signs and symptoms lasting from 4 to 8 years, beginning with changes to your menstrual cycle. Fluctuating estrogen levels during this time can cause your menstrual cycles to get longer or shorter.

Other signs and symptoms of perimenopause include:

• hot flashes
• night sweats
• mood changes
• difficulty sleeping
• vaginal dryness

5. Polycystic ovary syndrome (PCOS)

Irregular periods are the most common sign of PCOS. If you have PCOS, you may miss periods and have heavy bleeding when you do get your period.

PCOS can also cause:

• infertility
• excess facial and body hair
• male-pattern baldness
• weight gain or obesity

A 2015 study found that 44 percent of participants with menstrual irregularities also had thyroid disorders.

Hypothyroidism, or underactive thyroid, can cause longer, heavier periods and increased cramping. You may also experience fatigue, sensitivity to cold, and weight gain.

High levels of thyroid hormones, which is seen in hyperthyroidism, can cause shorter, lighter periods. You may also experience:

• sudden weight loss
• anxiety and nervousness
• heart palpitations

Swelling at the base of your neck is another common sign of a thyroid disorder.

7. Uterine fibroids

Fibroids are muscular tumors that develop in the wall of the uterus. Most fibroids are noncancerous and can range in size from as small as an apple seed to the size of a grapefruit.

Fibroids can cause your periods to be very painful and heavy enough to cause anemia. You may also experience:

• pelvic pain or pressure
• low back pain
• pain in your legs
• pain during sex

Most fibroids don’t require treatment and symptoms can be managed with over-the-counter (OTC) pain medications and an iron supplement if you develop anemia.

8. Endometriosis

Endometriosis affects 1 in 10 women of reproductive age. This is a condition in which the tissue that normally lines your uterus grows outside the uterus.

Endometriosis causes very painful, even debilitating menstrual cramps. Endometriosis also causes heavy bleeding, prolonged periods, and bleeding between periods.

Other symptoms may include:

• gastrointestinal pain
• painful bowel movements
• pain during and after intercourse
• infertility

Exploratory surgery is the only way to diagnose endometriosis. There’s currently no cure for the condition, but symptoms can be managed with medication or hormone therapy.

9. Being overweight

Obesity is known to cause menstrual irregularity. Research shows that being overweight impacts hormone and insulin levels, which can interfere with your menstrual cycle.

Rapid weight gain can also cause menstrual irregularities. Weight gain and irregular periods are common signs of PCOS and hypothyroidism, and should be evaluated by your doctor.

10. Extreme weight loss and eating disorders

Excessive or rapid weight loss can cause your period to stop. Not consuming enough calories can interfere with the production of the hormones needed for ovulation.

You’re considered underweight if you have a body mass index lower than 18.5. Along with stopped periods, you may also experience fatigue, headaches, and hair loss.

See your doctor if:

• you’re underweight
• have lost a lot of weight without trying
• you have an eating disorder

11. Excessive exercise

Intense or excessive exercise has been shown to interfere with the hormones responsible for menstruation.

Female athletes and women who participate in intensive training and physical activities, such as ballet dancers, often develop amenorrhea, which is missed or stopped periods.

Cutting back on your training and increasing your calorie count can help restore your periods.

12. Stress

Research shows that stress can interfere with your menstrual cycle by temporarily interfering with the part of the brain that controls the hormones that regulate your cycle. Your periods should return to normal after your stress decreases. Try these 16 techniques to relieve your stress.

13. Medications

Certain medications can interfere with your menstrual cycle, including:

• hormone replacement therapy
• blood thinners
• thyroid medications
• epilepsy drugs
• antidepressants
• chemotherapy drugs
• aspirin and ibuprofen

Speak to your doctor about changing your medication.

14. Cervical and endometrial cancer

Cervical and endometrial cancers can cause changes to your menstrual cycle, along with bleeding between periods or heavy periods. Bleeding during or after intercourse and unusual discharge are other signs and symptoms of these cancers.

Remember that these symptoms are more commonly caused by other issues. Speak to your doctor if you’re concerned.

When to call your healthcare provider

There are several possible causes of irregular periods, many of which require medical treatment. Make an appointment to see your doctor if:

• your periods stop for more than 3 months and you’re not pregnant
• your periods become irregular suddenly
• you have a period that lasts longer than 7 days
• you need more than one pad or tampon every hour or two
• you develop severe pain during your period
• your periods are less than 21 days or more than 35 days apart
• you experience spotting between periods
• you experience other symptoms, such as unusual discharge or fever

Your doctor will ask about your medical history and want to know about:

• any stress or emotional issues you’re experiencing
• any changes to your weight
• your sexual history
• how much you exercise

Medical tests may also be used to help diagnose the cause of your irregular bleeding, including:

• a pelvic examination
• blood tests
• abdominal ultrasound
• pelvic and transvaginal ultrasound
• CT scan
• MRI

Treatments

Treatment depends on what’s causing your irregular periods and may require treating an underlying medical condition. Your doctor may recommend one or more of the following treatments:

• oral contraceptives
• hormonal IUDs
• thyroid medication
• metformin
• weight loss or weight gain
• exercise
• vitamin D supplements

Stress reduction techniques may also help, including:

• yoga
• meditation
• deep breathing
• cutting back on work and other demands

How to track your period

Tracking your period is a good idea even when your period is regular. You can track your period on a calendar or in a notebook, or use one of the many period tracking apps available.

Begin tracking your period by marking the first day of your period on a calendar. Within a few months you’ll begin to see if your periods are regular or different each month.

Keep track of the following:

• PMS symptoms, such as headaches, cramps, bloating, breast tenderness, and moods
• when your bleeding begins and whether or not it was earlier or later than expected
• how heavy your bleeding was, including how many pads or tampons you used
• symptoms during your period, such as cramping, back pain, and other symptoms and how bad they were
• how long your period lasted and whether or not it was longer or shorter than your last period

Outlook

Irregular periods can be caused by a number of things, some of them serious. Your doctor can help you determine the cause and help you get your cycle back on track. Eating a balanced diet, getting regular exercise, and avoiding stress can also help.

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