Heavy or Irregular Periods: What Your Changing Cycle Is Telling You

For many Women the first sign of Perimenopause arrives in the bathroom. You may have 1 month when you feel like yourself, then a month of flooding periods, sore breasts, and a short fuse, then 2 months of night sweats and no period at all.

You may find yourself planning your week around your flow. Checking the chair when you stand up. Packing a spare set of clothes. Wondering whether a cycle of 21 days, and then 45, means something is wrong.

For most of my life, my cycles ran a steady 28 to 32 days. My own record lived for years in a note on my phone, a small heart beside each date. Written down, my Perimenopause was unmistakable: for 1 year in Perimenopause, my cycles really fluctuated, some as short as 19 days and some nearly 8 weeks long, sometimes back to back, and then they returned to their typical pattern, and then they fluctuated again. Seeing the pattern on the page turned a year of confusion into information I could bring to an appointment.

As 'Testing in Midlife' explains, the stages of the transition are marked by your calendar first and your blood second.

This chapter is a map. Read the drivers, find the ones that sound like you, and jump to the chapter that goes deeper. And if anything in 'When to Call Your Doctor Promptly', below, describes you, start there.

What Can Be Behind It

Cycles without ovulation, and low progesterone. Progesterone is made mainly after you ovulate, so as more cycles pass without ovulation, more months bring very little of it. Estrogen builds the uterine lining and progesterone signals it to shed cleanly, so without enough progesterone the lining can grow thicker, which is 1 reason periods turn heavy and flooding. 'What Is Actually Happening in Your Midlife Body' goes deeper, in its Progesterone section.

A short second half of your cycle. A luteal phase of 10 days or less, from ovulation to your next period, is 1 sign that progesterone is running short. It can show up as shorter cycles or spotting before your period, years before your periods become irregular.

Estrogen surges, and estrogen dominance. Early Perimenopause often brings estrogen higher than it ran in your 30's, and in some cycles estradiol surges again right when it would normally fall. Heavy periods with clots, tender breasts, bloating, and mood swings that build before you bleed are the classic signs, and 'Estrogen Dominance: What It Is, How to Spot It, and What Helps', in the Hormones chapter, goes deeper.

The normal map of the transition. In early Perimenopause, your cycle length starts to vary by 7 days or more from 1 cycle to the next. In late Perimenopause, you go 60 days or more between periods, and 'Testing in Midlife' walks through every stage.

Your thyroid. Low thyroid function can bring heavy periods and cycles without ovulation, which lowers progesterone further. Both can be true at once, and for many Midlife Women, they are, so 'Your Thyroid, In Depth' belongs on your reading list.

Iron and ferritin. Heavy bleeding drains your iron stores month after month, and low progesterone and low ferritin often travel together. Low ferritin can feel like exhaustion, anxiety, hair shedding, breathlessness on the stairs, and restless legs at night, and low iron also blunts your thyroid's conversion of T4 into T3, so the loop tightens. The section on low ferritin in 'Supplements: Test, Don't Guess' goes deeper.

Blood sugar and insulin. Insulin resistance lowers SHBG, the protein that carries your sex hormones, which is part of why it travels with irregular cycles, acne, and chin hair. 'Sugar, and the Addiction Nobody Names' shows how to read your blood sugar labs.

Stress, cortisol, and undereating. Stress, low thyroid function, and undereating all make ovulation less likely. Chronic undereating tells your body it is not a safe time to ovulate, and 'Stress' and 'Cortisol and Midlife Burnout' go deeper.

Your liver and your gut. Your liver packages used estrogen, and your gut decides whether it leaves or gets recycled. Constipation and high beta-glucuronidase send estrogen back for another lap, and 'How It All Connects' and 'Your Liver, Your Kidneys, and Your Gut' follow that round trip.

Inflammation and Autoimmunity. Autoimmune symptoms often intensify in the week or 2 before your period and ease after it. Inflammation can also push ferritin up and hide a real iron shortfall, as 'Inflammation' and 'How Autoimmunity Begins' explain.

Changes inside the uterus. ACOG and Mayo Clinic list fibroids, polyps, adenomyosis, and endometriosis among the causes of heavy bleeding, and less commonly endometrial hyperplasia or cancer. These need an exam and imaging, which is why a changing cycle always deserves a conversation with your gynecologist.

Fibroids and adenomyosis are among the most common reasons a Woman in her 40's starts flooding, and endometriosis reaches well beyond the pelvis, into the gut, the bladder, the immune system, and mood. 'Endometriosis, Adenomyosis, and Fibroids: How a Pelvic Diagnosis Reaches Your Whole Body' walks through all 3, the imaging that finds them, and what helps.

Medications, devices, and bleeding disorders. ACOG names blood thinners, aspirin, and copper IUDs, along with bleeding disorders. Spotting is also common in the first months of hormone therapy, as 'Hormone Therapy 101' explains.

Pregnancy. The US Office on Women's Health notes that you can still get pregnant during Perimenopause, even if you miss your period for a month or a few months. A late or unusual period can be pregnancy, and ACOG lists miscarriage and ectopic pregnancy among the causes of heavy bleeding.

What Helps

Keep your record. Your cycle log turns 'my periods are weird' into 'my cycles have gone from 28 days to anywhere between 24 and 38, and I am changing protection twice as often'. A provider can do a great deal with those sentences.

Refill your iron, and ask why it ran low. Heme iron from red meat, liver, and organ meats absorbs best, and liver capsules are an easy way in. The only iron brand I recommend is Three Arrows Nutra, whose Iron Repair Simply contains iron alone. Research suggests taking iron every other day can improve absorption.

When stores are very low or oral iron has not worked, ask about Venofer, iron sucrose, by name.

My own iron story taught me the question to ask.

I was diagnosed with anemia and had a series of 6 Venofer infusions, and at another point, 3 more.

Low iron was a clue, and the question it pointed to was why my body was not holding on to iron. For me the answers were a slow thyroid, low stomach acid, an inflamed gut, SIBO, and depleted hormones, and today my ferritin sits around 100.

Support progesterone. When testing confirms it is low, bioidentical progesterone is a prescription conversation. For heavy periods in Perimenopause, prescribers often time it to the second half of the cycle or use it nightly, and 'Hormone Therapy 101' walks through how it is taken.

Help estrogen leave on schedule.

• Aim for 6 to 15 different kinds of vegetables a day, more vegetables than fruit, with cruciferous vegetables most days. Cooked vegetables are gentler while your gut heals.
• Move your bowels daily, with steady fiber from many kinds of vegetables.
• Drink less alcohol, which raises estrogen levels.
• Store and heat food in glass or stainless steel, decline paper receipts, and choose fragrance-free products.

When testing shows the pattern, supplements such as calcium D-glucarate, DIM, and magnesium glycinate may help, after testing and with your prescriber's knowledge. Estrogen dominance was part of my own picture, and bringing my levels down took a little over a year of steady care.

Optimize your thyroid, steady your blood sugar, and eat enough. Each 1 makes ovulation more likely, and 'Your Thyroid, In Depth', 'Sugar, and the Addiction Nobody Names', and 'Stress' show you where to begin.

Know the medical options for heavy bleeding. ACOG lists hormonal birth control, hormone therapy for Perimenopause-related bleeding, tranexamic acid, NSAIDs, and GnRH agonists. A levonorgestrel hormonal IUD can also protect the uterus and double as birth control, and procedures such as endometrial ablation, myomectomy, or hysterectomy sit further along; every medication and procedure decision stays with your gynecologist.

Plan for birth control until you are sure. The US Office on Women's Health advises continuing birth control until 1 full year after your last period if you do not want to get pregnant.

When to Call Your Doctor Promptly

These are the signs of heavy or abnormal bleeding that ACOG, Mayo Clinic, and the NHS name. Bring them to your practitioner promptly:

• Any bleeding after Menopause, once you have gone 12 months without a period. The US Office on Women's Health advises seeing a health care provider as soon as possible.
• Soaking through 1 or more pads or tampons every hour for several hours in a row. Mayo Clinic advises immediate medical attention if bleeding soaks at least 1 pad or tampon an hour for more than 2 hours in a row.
• Clots as big as a quarter or larger.
• Bleeding that lasts more than 7 days.
• Needing to wear more than 1 pad at a time, or changing protection during the night.
• Bleeding more often than every 3 weeks.
• Bleeding between periods or after sex.
• Severe pain with your periods, or pain when you pee, move your bowels, or have sex.
• Tiredness or shortness of breath alongside heavy periods, since heavy bleeding can lead to iron deficiency anemia.
• Heavy bleeding when you could be pregnant, especially with pain.
• On hormone therapy: heavy bleeding, bleeding that continues past about 6 months, or bleeding that starts after a stretch of none.
• Periods that stop before 40.