Over the past few years in my practice, I’ve had so many women say the same thing:
“I feel like my body has suddenly become reactive to everything.”
And honestly? I’ve experienced this myself too.
Random itching (often at night), flushing in the face, heart palpitations, feeling anxious at 3am…
Reactions to foods that never used to be a problem…
Suddenly not tolerating wine…
It can feel confusing and unsettling.
So naturally, the questions start:
- Is it stress?
- Is it hormones?
- Is something wrong with my gut?
And very often, the missing piece is histamine.
In this blog, I want to walk you through what histamine actually is, why it becomes an issue in perimenopause, and what you can do about it.
What Is Histamine (And Why Do You Have It)?
Most people associate histamine with allergies.
But histamine is actually a normal and essential chemical messenger in the body.
It plays a role in:
- Immune function
- Digestion
- Brain signalling
- Sleep-wake cycles
- Stomach acid production
Your body both produces histamine and takes it in through food.
Normally, this isn’t a problem, because your body breaks it down efficiently.
One of the key enzymes responsible for this is called DAO (diamine oxidase), which works in the gut.
In a healthy system:
- Histamine comes in
- Histamine is produced
- Histamine is broken down
Everything stays balanced.
But when histamine builds up faster than your body can break it down, symptoms begin.
Mast Cells: The “Security Guards” of Your Immune System
A key player here is something called a mast cell.
I often describe mast cells as the security guards of your immune system.
Their job is to respond to potential threats.
When activated, they release chemicals, including histamine.
That release can lead to symptoms like:
- Flushing
- Itching
- Headaches
- Runny nose
- Digestive issues
- Anxiety or racing heart
- Sleep disruption
This is helpful in the right context.
But when mast cells become overactive or overly sensitive, histamine can be released too easily, and too often.
Why Histamine Issues Show Up in Perimenopause
This is where things get really interesting.
Histamine and oestrogen have a two-way relationship:
- Oestrogen can stimulate mast cells to release histamine
- Histamine can stimulate more oestrogen production
This creates a feedback loop.
During perimenopause, oestrogen doesn’t decline smoothly, it fluctuates.
Some cycles you may produce high levels.
Other cycles you may barely ovulate.
At the same time, progesterone (which normally calms mast cells) often starts to decline earlier.
So you get:
- More histamine release
- Less calming effect from progesterone
And this is why so many women feel like their body has suddenly become more reactive.
Common Histamine Symptoms in Perimenopause
Histamine issues don’t always look like classic allergies.
Some of the most common symptoms include:
- Facial flushing
- Itching or tingling skin
- Headaches or migraines
- Bloating or digestive discomfort
- Anxiety or feeling “wired”
- Heart palpitations
- Runny nose or sinus congestion
- Waking at 3-4am
- Reacting to wine or fermented foods
What makes this tricky is that symptoms can be inconsistent.
You might tolerate something one day… and react to it the next.
Common Histamine Triggers
Certain foods can be higher in histamine, including:
- Alcohol (especially wine)
- Aged cheeses
- Fermented foods
- Leftovers
- Processed meats
- Chocolate
- Vinegar
- Tomatoes
- Avocados
But food is only part of the picture.
Other triggers include:
- Poor sleep
- Chronic stress
- Gut dysfunction
- Infections
- Mould exposure
- Nutrient deficiencies
- High oestrogen levels
This is why many women say:
“I haven’t changed my diet, so why am I reacting?”
Because the root cause isn’t always food.
The Gut–Histamine Connection
Your gut plays a major role in how well you tolerate histamine.
Firstly, DAO, the enzyme that breaks down histamine, is produced in the gut lining.
If the gut is inflamed or damaged, DAO production can drop.
Secondly, some gut bacteria actually produce histamine.
So if the microbiome is imbalanced, histamine levels can increase.
This is why histamine issues often show up alongside:
- IBS
- SIBO
- Food sensitivities
- “Leaky gut”
Supporting gut health is often a key step in improving symptoms.
What Actually Helps?
This isn’t about becoming fearful of food or staying on a restrictive diet forever.
Instead, the goal is to reduce the histamine load temporarily while supporting the body.
Helpful strategies include:
1. Temporarily lowering high-histamine foods
Reducing things like wine, aged cheese, and leftovers can often bring quick relief.
2. Supporting gut health
- Improving digestion
- Increasing fibre diversity
- Addressing imbalances if needed
3. Managing stress
Stress can make mast cells far more reactive — this is a big one.
4. Supporting progesterone
Progesterone helps stabilise mast cells.
When levels are low, histamine issues often feel worse.
Nutrients and Supplements That Can Help
Supplements can be supportive, but they’re not the whole solution.
Some that may help include:
- DAO enzyme supplements (before meals)
- Quercetin (a natural mast cell stabiliser)
- Vitamin C (supports histamine breakdown)
- Magnesium (supports the nervous system)
- Vitamin B6 (involved in histamine metabolism)
- Certain probiotic strains like Lactobacillus rhamnosus
These can help while you work on the root causes, gut health, stress, and hormone balance.
A Quick Reassurance
If this sounds familiar, I want you to know:
Your body isn’t broken.
What you’re experiencing may be a temporary imbalance between histamine production and breakdown.
And when you support the underlying systems, hormones, gut, and nervous system, many women see real improvements.
Where would you like to go next?
If this resonated with you, there are a few ways we can continue the conversation.
Listen to the podcast
This article is based on Episode 80 of the Empowered Perimenopause Podcast; Itchy, Flushed, and Reactive Out of Nowhere? Understanding Histamine In Perimenopause.
Listen to the episode here.
Free quiz: Start making sense of your symptoms
If you’re wondering whether what you’re experiencing could be related to perimenopause, my free Perimenopause Quiz is a great place to begin.
In just a few minutes, you’ll gain a better understanding of where you are in your perimenopause journey, along with personalised guidance to help you take your next steps with confidence.
Take the free Perimenopause Quiz here.
Join my Tuesday Newsletter
Every Tuesday morning I send a gentle email full of evidence-informed guidance, practical midlife insights, my latest podcast episode, and a little encouragement to carry with you into the week.
I’d love to have you there.
Join my weekly newsletter here.
Looking for ongoing support?
If you’re ready to better understand your changing body with expert guidance and a supportive community of women navigating this season alongside you, I’d love to welcome you inside Midlife Thrive.
You’ll find monthly live coaching calls, practical teaching, and a calm, evidence-based space to ask questions and learn with confidence.
Learn more about Midlife Thrive here.
Need personalised support?
If you’d like one-to-one guidance tailored specifically to you, you can find out more about working with me through my nutritional therapy consultations.
Explore one-to-one support here.
