Reasons Behind Irregular Menstrual Cycle

What are irregular periods?

Most women and people assigned female at birth (AFAB) have menstrual periods that last four to seven days. Your period usually occurs every 28 days, but a regular menstrual cycle can range from 21 days to 35 days. In fact, the average cycle length is 29 days. Many things cause irregular periods (or irregular menstruation) such as changes in hormone levels, stress, certain health conditions, medications, etc.

What are examples of irregular periods?

Your period is still considered “regular” even if it varies slightly from cycle to cycle. Examples of irregular menstruation include:

• Periods that occur fewer than 21 days or more than 35 days apart.
• Missing three or more periods in a row.
• Menstrual flow (bleeding) that’s much heavier or lighter than usual.
• Periods that last longer than seven days.
• The length of time between cycles varies by more than nine days. For example, one cycle is 28 days, the next is 37 days and the next is 29 days.
• Periods that are accompanied by severe pain, cramping, nausea or vomiting.
• Bleeding or spotting that happens between periods, after menopause or after sexual intercourse.
• Soaking through one or more tampons or sanitary pads in an hour

Your menstrual cycle may not always be predictable — and that may be OK. It’s normal to have slight variations in cycle length or have a menstrual period that seems slightly heavier or lighter in flow than your previous period. Menstrual irregularities are fairly common, and you don’t have to be able to predict your cycle to the exact day for it to be considered “normal.”

Conditions related to irregular menstruation

• Amenorrhea: A condition where your periods have stopped completely. The absence of a period for 90 days or more is considered abnormal unless you’re pregnant, breastfeeding or going through menopause (which generally occurs between ages 45 and 55). If you haven’t started menstruating by age 15 or 16 or within three years of your breasts developing, you may also have amenorrhea.
• Oligomenorrhea: A condition where your periods occur infrequently. You may go more than 35 days between periods or have six to eight periods a year.
• Dysmenorrhea: A medical term for painful periods and severe menstrual cramps. Some discomfort during your cycle is normal.
• Abnormal uterine bleeding: Abnormal uterine bleeding is bleeding between monthly periods, prolonged bleeding or an extremely heavy period.

What are the causes of Irregular periods?

There are many causes of irregular periods, ranging from stress to more serious underlying medical conditions.

Medical conditions

Certain health conditions are associated with missed menstrual periods. They include:

• Endometriosis: Endometriosis occurs when endometrial tissue grows outside of your uterus. The tissue often attaches itself to your ovaries or fallopian tubes. Endometriosis may cause abnormal bleeding, cramps or severe pain before and during your period.
• Pelvic inflammatory disease: Pelvic inflammatory disease (PID) is a bacterial infection that affects the female reproductive system. It’s typically caused by an untreated sexually transmitted infection (STI). Bacteria enter your vagina and spread to your uterus and upper genital tract. Symptoms of PID include a heavy vaginal discharge with an unpleasant odour, irregular periods and pelvic pain.
• Polycystic ovary syndrome: In polycystic ovary syndrome (PCOS), your ovaries make large amounts of androgens, which are a type of hormone. This hormone prevents or delays ovulation, causing irregular periods. People with PCOS may stop menstruating completely.
• Primary ovarian insufficiency: This condition occurs in cisgender women under age 40 whose ovaries don’t function as they should, causing missed or irregular periods. It can occur during treatment for cancer with chemotherapy and radiation or if you have certain autoimmune conditions.
• Thyroid or pituitary gland disorders: Hypothyroidism (underactive thyroid), hyperthyroidism (overactive thyroid) and other thyroid or pituitary gland disorders affect your hormones. This causes your period to be irregular.
• Bleeding disorders: You may experience heavy menstrual bleeding if you develop a bleeding or blood clotting disorder.
• Uterine cancer or ovarian cancer: Certain cancers can affect a person’s menstrual period. Changes may include bleeding that’s heavier than usual or missed periods

Lifestyle factor

Disruptions or changes in your daily routine can have an impact on your menstrual cycle. Some examples of lifestyle factors include:

• Stress.
• Gaining or losing a significant amount of weight.
• Exercise routines that result in very low body fat (long-distance runners, dancers or gymnasts).
• Viruses or other illnesses.

Other causes of irregular menstrual cycle include:

• Birth control pills: Most birth control pills contain a combination of hormones. The pills prevent pregnancy by keeping your ovaries from releasing eggs. Going on or off birth control pills can affect menstruation. You may have irregular or missed periods for up to six months after discontinuing birth control pills.
• Medications, such as steroids or anticoagulant drugs (blood thinners).
• Miscarriage or an ectopic pregnancy (the fertilized egg implants outside your uterus).
• Surgery, scarring or blockages in your uterus, ovaries or fallopian tubes.

How to lower your risk of having an  irregular menstrual period/cycle

Here are some recommendations for self-care:

• Try to maintain a healthy lifestyle by exercising moderately and eating nutritious foods. If you want to lose weight, do it gradually instead of turning to diets that drastically limit your calorie and food intake.
• Make sure you get enough rest.
• Practice stress reduction and relaxation techniques.
• Cut back on prolonged or intense exercise routines.
• Use birth control pills or other contraceptive methods as directed.
• Change your tampons or sanitary pads every four to six hours to avoid toxic shock syndrome and prevent infections.
• See your gynaecologist and primary care provider for regular check-ups.

Medications for irregular periods

Medications are often the first treatment for irregular periods. If medication doesn’t help, your provider may recommend surgery. Possible medications include

• Hormonal birth control: Irregular or heavy bleeding caused by PCOS, uterine fibroids, endometriosis or other medical conditions may be managed with hormonal birth control. They also help by regulating your cycle, making it more predictable. These can be combination hormonal birth control pills that consist of estrogen and progestin, or progestin-only birth control. Both types come in different forms like pills, a vaginal ring, injection or an IUD (intrauterine device).
• Tranexamic acid: A medication prescribed to treat heavy menstrual bleeding. You take one pill at the start of your period to control your bleeding.
• Pain relievers: You may find relief from mild to moderate pain or cramps by taking an over-the-counter pain reliever, such as ibuprofen or acetaminophen.
• Hormone therapy: Hormone therapy may be helpful if your irregular period is due to perimenopause. It can also help with other menopausal symptoms like vaginal dryness and hot flashes. There are risks associated with hormone therapy, so be sure to discuss these with your healthcare provider.
• Antibiotics: You may be given antibiotics if the cause of irregular bleeding is from an infection.
• Gonadotropin-releasing hormone agonists: These medications shrink the size of uterine fibroids and control heavy bleeding, but temporarily stop your menstrual period.

When you should see your doctor about irregular periods?

Contact a healthcare provider if you have painful or irregular periods or any of the following symptoms:

• Severe pain (cramping) during your period or between periods.
• Unusually heavy bleeding (soaking through a sanitary pad or tampon every hour for two to three hours) or passing large clots (larger than a quarter).
• Foul-smelling vaginal discharge.
• A period lasting longer than seven days.
• Vaginal bleeding or spotting between periods or after you’ve gone through menopause.
• Periods that become very irregular after you’ve had regular menstrual cycles.
• Nausea or vomiting during your period.
• Symptoms of toxic shock syndrome (TSS), such as fever, vomiting, diarrhoea, fainting or dizziness.

You should also see your provider if you think you might be pregnant.

FAQs

How much delay in periods is normal?

Slight delays in your period are typically OK. Some people are able to predict their period to the exact day, while others can’t. Contact your provider if you notice a sudden change in the time between cycles or the duration (days) of your period, especially if it’s significant. This doesn’t always indicate a problem, but it’s a good idea to get it checked out.

Is it normal if I miss my period for two months?

Skipping one or two periods isn’t ideal, but it’s not too concerning. Take a look at any changes in your life recently. Things like stress, a new workout routine, losing or gaining weight, or changing birth control can all impact your cycle. Call your healthcare provider if you miss your period for three or more months in a row or if you experience other unusual symptoms during your next period.

When are irregular periods more common?

Irregular periods are more common when you first begin menstruating (around age 9 to 14) or during perimenopause (around age 50 or just before menopause).

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