Why am I bleeding again?

There is one thing I hear over and over in my office.

Women sit down across from me and describe perimenopause the same way: it feels like PMS-ing all the time. Not just the week or ten days before your period — but most of the month, every month. If that resonates, keep reading.

If you have noticed that your periods have started doing things you do not recognize — coming closer together, then disappearing for weeks, then showing up with a vengeance — you are not imagining it. And you are definitely not alone.

There is a name for what is happening, and there is a real, well-studied explanation behind it. It is called a LOOP (Luteal-Out-of-Phase) cycle, and once you understand it, so much of what you have been feeling will finally make sense.

First, a quick refresher on a normal cycle

In a typical month, your ovaries select one egg to mature. Around day 14, that egg is released — that is ovulation. The little structure left behind on the ovary, called the corpus luteum, then produces a strong rise in progesterone for the second half of your cycle.

That progesterone is doing some really important things. For one, it is sending a signal to your brain that says, "We are good here. No need to start a new cycle yet." Your brain listens, holds steady, and waits. When progesterone eventually falls, your period arrives, and the next cycle begins right on schedule. Clean, predictable, well-timed.

That is the version most of us learned about in health class. And for most of your reproductive years, that is more or less how things ran.

What changes in perimenopause

As you move into your 40s, the eggs left in your ovaries are no longer the strongest of the bunch. The cells around them, which are the cells that produce progesterone after ovulation, do not work quite as efficiently as they used to. So when ovulation happens, the progesterone surge afterward is smaller than it should be.

Here is where it gets interesting.

That weaker progesterone signal is not strong enough to tell your brain to hold steady. So your brain, not getting the "all clear," starts ramping up the hormone that recruits new eggs — a hormone called FSH — before your current cycle has even finished.

When new eggs get recruited early, they start making estrogen. And that new estrogen gets layered on top of the estrogen and progesterone from the cycle that has not quite ended yet. The result is estrogen levels that can climb much higher than they ever did in your 20s or 30s — sometimes dramatically higher.

That is what is behind so many of the symptoms my patients describe in early perimenopause. The breast tenderness that feels like nothing you have experienced before. The bloating that does not quit. The mood instability that catches you off guard. The PMS that suddenly feels three times worse than it used to. The heavy, flooding periods.

This is not in your head. It is your hormones doing something genuinely new.

A LOOP cycle can resolve in one of two very different ways, and this is what explains the wild swings in your cycle length.

Sometimes ovulation happens from that newly recruited egg. When that occurs, your next period arrives much sooner than expected — often less than 21 days from the last one. Your follicular phase, the first half of the cycle, was already underway before the previous cycle ended, so the whole thing finishes early. This is when you find yourself thinking, "Did I just have a period? Why am I bleeding again?"

Other times, ovulation does not happen at all. Without ovulation, there is no progesterone produced. And without progesterone, there is nothing telling your uterine lining to stop building up. So it keeps thickening, week after week, under all that unopposed estrogen — until it eventually outgrows its own blood supply and sheds in a heavy, prolonged bleed. That is the cycle that stretches past 36 days and arrives with flooding, cramping, and a force that feels brand new.

That said, "normal for perimenopause" does not mean you have to white-knuckle your way through it. Heavy bleeding, debilitating PMS, breast pain that interrupts your sleep, mood changes that affect your relationships — these are all things we can address. There are evidence-based options that can smooth out the hormonal chaos and help you feel like yourself again.

This is the science behind so much of what is happening in early perimenopause — the unpredictability is not random. It is a predictable consequence of declining ovarian reserve disrupting the feedback loop.

Would you like to learn more about what we can do about it? Click here if you would like to book an appointment with me.