Heavy, Irregular, or Missed Periods: What's Normal During Perimenopause — and What Isn't

"My periods are all over the place."

This is one of the first changes many women notice during perimenopause.

One month your period comes early.

The next month it's two weeks late.

Then you skip one altogether.

Then the following month it's heavier than it's ever been.

It's frustrating — but in many cases, it's completely normal.

The important part is knowing where normal ends and when it's time to investigate further.

Why your cycle changes during perimenopause

During perimenopause, ovulation becomes less predictable.

Some months you ovulate normally.

Other months you don't ovulate at all.

Those hormonal fluctuations affect how the uterine lining builds up and sheds, which is why bleeding patterns often become unpredictable.

It's completely normal for your cycle to become less predictable as your ovaries gradually produce less estrogen and progesterone.

Changes that are often normal

Many women experience some combination of:

• Cycles becoming shorter at first
• Later becoming farther apart
• Skipped periods
• Heavier periods some months
• Lighter periods other months
• More spotting before a period
• Increased cramping
• Worse PMS symptoms

Every woman experiences this transition differently.

Some women continue having monthly periods until menopause.

Others have months between cycles.

Both can be normal.

When bleeding should be evaluated

Even though irregular bleeding is common during perimenopause, there are certain patterns that should never be ignored.

I recommend seeing your healthcare provider if you experience:

• Soaking through a pad or tampon every hour for two or more hours
• Passing clots larger than a quarter
• Bleeding lasting longer than seven days
• Bleeding between periods
• Bleeding after intercourse
• Cycles that are consistently less than 21 days apart
• Bleeding that's causing you to miss work, avoid activities, or significantly affecting your quality of life

These symptoms don't automatically mean something serious is wrong.

But they deserve an evaluation.

Bleeding after menopause is different

Once you've gone 12 consecutive months without a period, menopause has officially occurred.

Any vaginal bleeding after that point is called postmenopausal bleeding.

Most cases are caused by something benign, such as thinning of the vaginal or uterine lining.

However, postmenopausal bleeding can also be a symptom of endometrial cancer.

That's why every episode of postmenopausal bleeding should be evaluated — even if it only happens once.

The evaluation often includes a transvaginal ultrasound and, depending on the results and your risk factors, sometimes an endometrial biopsy.

Don't forget about iron

One thing I see frequently is women who have been dealing with heavy periods for years.

They assume they're tired because of hormones.

Sometimes that's true.

But sometimes they're actually iron deficient.

Heavy menstrual bleeding can gradually deplete your body's iron stores, even before you become anemic.

Iron deficiency can contribute to:

• Fatigue
• Brain fog
• Hair shedding
• Shortness of breath with activity
• Restless legs
• Difficulty concentrating

For women with heavy bleeding, I often recommend checking a complete blood count and iron studies, including ferritin.

Sometimes correcting iron deficiency makes a tremendous difference in how someone feels.

What if you're taking hormone therapy?

Hormone therapy can also affect bleeding patterns, particularly during the first several months.

Some spotting is common when first starting certain hormone therapy regimens.

However, persistent bleeding, heavier bleeding, or bleeding that begins after months of stability should be discussed with your healthcare provider.

If you're taking progesterone, taking it consistently is also important, as missed doses can contribute to unexpected bleeding.

What does an evaluation usually include?

Depending on your symptoms, your evaluation may include:

• A detailed menstrual history
• Pelvic examination
• Pregnancy testing when appropriate
• Complete blood count (CBC)
• Iron studies (including ferritin)
• Thyroid testing when indicated
• Transvaginal ultrasound
• Endometrial biopsy if needed

Sometimes everything turns out to be related to normal hormonal changes.

Other times we identify a uterine polyp, fibroid, thyroid condition, or another treatable cause.

The important thing is not assuming every bleeding change is "just menopause."

The bottom line

Perimenopause is a time of change.

Irregular periods are expected.

Skipped periods are common.

Some months will be heavier than others.

But heavy bleeding, bleeding between periods, bleeding after menopause, or bleeding that's interfering with your life shouldn't simply be dismissed.

If something doesn't feel right, it's worth bringing it up.

Most causes are treatable, and sometimes having the conversation early can prevent much bigger problems later.