Gut Symptoms Before Your Period | with Angela Hywood

Ever feel like your digestion takes on a life of its own right before your period? Maybe it’s bloating, loose stools, or just that unsettling gut sensitivity that hits you like clockwork every month.

If you’ve been told it’s “just IBS” or “just hormones”, well, you’re not wrong… but the why matters.

Let’s take a closer look at how your hormones are not only influencing your cycle and mood, but also the very workings of your gut.

Hormones & Neurotransmitters: The Gut-Brain Connection

Your body is full of brilliant chemical messengers and two of the most influential are your reproductive hormones: oestrogen and progesterone. They don’t just control ovulation and menstruation, they also impact your brain, nervous system, and yes, your bowels.

OESTROGEN BOOSTS SEROTONIN (HAPPINESS + JOY)

Oestrogen increases serotonin production and sensitivity. Serotonin is the “feel good” neurotransmitter that also happens to regulate gut motility. More serotonin = faster-moving bowels. Great in balance, but too much can mean bloating or urgent trips to the loo.

PROGESTERONE SUPPORTS GABA (CALM + COLLECTED)

Progesterone, particularly its calming metabolite allopregnanolone, enhances GABA, a calming neurotransmitter that slows everything down (including your digestion). Think of it as the body’s built-in chill pill. In short? Oestrogen revs things up, and progesterone calms things down. They’re meant to work in harmony, but when that balance is off, your gut may be the first to notice.

Diarrhoea Before Your Period? That’s a Hormonal Clue

The second half of your cycle (your luteal phase) is when progesterone should rise and gently slow gut motility. But if oestrogen dominates, because progesterone is low, or oestrogen is too high, you may experience:

• Loose stools or diarrhoea
• Cramps and bloating
• Mood swings
• Heightened gut sensitivity

One key culprit? Histamine and inflammation.

Oestrogen reduces the activity of DAO, an enzyme that breaks down histamine in the gut. More oestrogen → more histamine → more gut stimulation and inflammation → diarrhoea.

Hot tip: If diarrhoea hits right before your period, it may be more than PMS, it’s your body telling you there’s an oestrogen-histamine-serotonin storm brewing.

Oestrogen + The Gut: Helpful, Until It’s Not

In balance, oestrogen is gut-protective:

• It strengthens the gut lining
• Increases blood flow to the digestive tract
• Helps regulate immune function

But too much, especially when not properly detoxified, can lead to:

• Bloating and water retention
• Food sensitivities
• Cramping and nausea
• Diarrhoea or constipation
• Gut inflammation and leaky gut

It’s a classic example of “too much of a good thing” gone rogue.

Why Digestion Changes Across Your Cycle

Oestrogen and progesterone fluctuate across the month and so might your gut function. Here’s what many women experience:

• Mid-cycle (ovulation): Oestrogen peaks → increased serotonin → looser stools, more bloating
• Luteal phase (before period): Progesterone rises → slows digestion → constipation for some
• Pre-period: If oestrogen is still high (or progesterone is low), histamine + serotonin = gut chaos, headaches, itchiness, congestion.

This hormonal rhythm may explain why some women get cyclical gut issues that mimic IBS, but don’t respond well to conventional treatment.

How Oestrogen Affects Your Gut Lining

Another lesser-known role of oestrogen is its effect on the integrity of your gut barrier. At healthy levels, oestrogen promotes tight junctions (those little gatekeepers between your gut cells). But in excess, oestrogen can:

• Increase gut permeability (“leaky gut”)
• Aggravate immune responses
• Heighten sensitivity to foods and stress

All of which may leave you feeling inflamed, puffy, and like your digestion is working against you.

What You Can Do About It

The good news? You can absolutely support hormonal balance and gut health, naturally and effectively. Simple steps to get started:

• Eat more cruciferous veggies (think broccoli, cauliflower, brussels sprouts) to support oestrogen detox.
• Reduce histamine-rich foods (like red wine, aged cheese, and processed meats) if you’re sensitive.
• Support DAO activity with nutrients like vitamin C, B6, and quercetin.
• Track your cycle and symptoms. Knowledge is power.
• Prioritise stress support, sleep, and wholefoods (your GABA and serotonin will thank you!)

Let’s Talk About Your Hormones

If you suspect your hormones are behind your gut troubles, mood changes, or that frustrating premenstrual pattern you can’t quite crack. You are not imagining it, and you are not alone.

Let’s explore your hormone story together. Book in for a personalised consultation where we’ll assess your hormonal rhythm, gut health, histamine load, and more, with real answers and a practical, personalised plan. To book an appointment for your personalised treatment plan  book a consult with Angela here.

Naturopath and Founder of Floralia Wellness & Apothecary, Angela Hywood, has been specialising in women’s health, hormones and fertility for 30 years.