Why Your Hormones Feel Worse in Autumn (& What Helps)

You slept a full nine hours the weekend the clocks went back. So why are you sitting at your desk on Monday feeling like you've been hit by a bus?

You're not imagining it, and you're not being dramatic. As the light drops and the mornings turn dark, hormone symptoms across the board quietly ramp up — and almost nobody connects the two. One 2025 survey of more than 19,000 women found their symptoms were most problematic in autumn. Not summer. Not deep winter. Now.

Here's the bit that matters: autumn doesn't cause a hormone problem out of nowhere. It stacks on top of one you already have. Less daylight means less serotonin and less vitamin D, your body clock lurches when the hour changes, and your stress hormones get louder to cover the gap. Layer that onto perimenopause, PCOS, PMDD or endometriosis, and the season turns the volume up on everything.

As a registered medical herbalist who sees these patterns in clinic every week, I can tell you the way autumn lands depends entirely on which pattern you're already carrying. So find yourself below — and take the one thing that's yours to do this week.

For the one who's suddenly shattered by 4pm

You're capable. You're the one who gets things done. And right now you're eyeing your bed at half three in the afternoon and wondering what happened to you.

Here's what happened: the light went. Shorter days mean your body makes less serotonin and less vitamin D, and if you're in perimenopause, that's landing on top of oestrogen that's already fluctuating and dragging your energy with it. Two dips, one body. No wonder you're flattened.

This isn't a willpower problem. It's a light-and-hormones problem, and it responds to light-and-hormones solutions.

Do this this week:

• Get outside within an hour of waking, even for ten minutes. Morning light is the single most effective reset for a body clock that's been thrown by the time change.

• Ask your GP for a vitamin D test before you start guessing with supplements. Deficiency is rife by autumn and it quietly worsens fatigue and low mood.

• Eat protein at breakfast, before the coffee. It steadies the blood sugar that otherwise crashes you into that 4pm wall.

If you're doing all of that and still running on empty, that's your signal it's worth looking properly — not pushing harder. Not sure whether it's perimenopause or something else? Decode your symptoms in five minutes and see which pattern you're actually in.

For the one carrying everyone else through the dark months

You're the one who keeps the show on the road. The appointments, the packed lunches, the emotional weather of an entire household. And you're doing it while your own body is staging a quiet protest.

If you live with endometriosis, you may have noticed your pain gets sharper as it gets colder — and you're right. Cold and dropping barometric pressure make already-sensitive nerves fire harder, which is why a flare in winter can spread beyond the pelvis into your back, legs, even your ribs. Clinically, the women I work with often describe autumn and winter as their hardest stretch, and there's a real physiological reason for it, not just "the holidays are stressful."

And if it's PMDD you're managing, the luteal week — the seven to ten days before your bleed — is brutal enough without a seasonal low sitting underneath it.

Do this this week:

• Warm your core, not just your hands. A heat patch or thermal layer over the pelvis and lower back can head off the clench-and-flare reaction before it starts.

• Look at the next fortnight and find your luteal week. If it lands in the darkest part of the month, protect it now — move what you can, say no to one thing.

• Keep moving gently. Not a bootcamp — a walk, a stretch. Stillness in the cold lets pain and stiffness settle in.

You spend your life anticipating everyone else's needs. This season, put a fraction of that skill toward anticipating your own. If cold-weather flares are your reality, the Endo Flare Map helps you track the pattern and walk into your GP with something they can't dismiss — and if it's the luteal week that floors you, the 7-Day Luteal Survival Plan gives you one page a day to get through it.

For the one whose mood drops with the light

Some autumns you just feel yourself go quiet. Flatter. Less interested in the things you usually love. And you can't always tell whether it's your cycle, your hormones, or the dark closing in.

Here's something that might reframe the whole thing: research shows 46% of people with seasonal affective disorder also meet the criteria for PMDD. These two overlap far more than anyone tells you. It's what I call a double winter — a luteal-phase low landing inside a seasonal low, each making the other harder to climb out of.

And if you're in perimenopause, the picture muddies further, because low mood, brain fog and carb cravings belong to both the perimenopause list and the seasonal one. No wonder it's hard to know what you're dealing with.

The way through isn't guessing. It's tracking.

Do this this week:

• For two weeks, note your mood alongside your cycle day. If the dip reliably tracks the days before your bleed, that points one way. If it tracks the dark regardless of your cycle, that points another. Often it's both — and knowing that changes everything about how you support it.

• Get morning light early and often. It genuinely moves the needle on the seasonal side of the picture.

• Be honest about the timing with someone who can help you read it.

You don't have to white-knuckle your way to spring. There's a real, named pattern here, and named patterns can be worked with. If mapping your cycle to the season speaks to you, find your cycle's season by the moon — it's a gentle way to start seeing the rhythm underneath the low.

For the one holding it all together on willpower

From the outside, you're thriving. Inside, you know exactly how much effort it's taking to stay upright — and autumn just moved the goalposts.

If you have PCOS, the colder months hit a specific way. Insulin resistance makes your energy and weight stickier at the best of times; add darker mornings, shifting activity levels and the seasonal pull toward comfort food, and it can feel like your body's actively working against you. Then there's the iron: PCOS often comes with heavier bleeds, and low iron drags fatigue down to a level no amount of coffee touches.

The trap here is treating it as a discipline problem. It isn't. It's a blood-sugar-and-hormones problem wearing a discipline costume.

Do this this week:

• Anchor every meal with protein, fat and fibre. Steady blood sugar is the lever that quietly governs your energy, your cravings and your mood — far more than "trying harder" ever will.

• Don't skip meals to "save" calories in the run-up to Christmas. With PCOS, skipping meals backfires into bigger crashes and stronger cravings.

• Ask for an iron check (ferritin, specifically). If you're running low, that alone could be the difference between coping and floundering.

You've been carrying this on effort. Imagine how it feels to carry it on the right support instead. If you want a simple place to start, The Hormone Pattern Starter Guide walks you through the three patterns behind most PCOS symptoms and the small shifts that steady them — for £9.

The thread running through all of it

Four different women, four different patterns — and one season quietly turning the dial up on every one of them. That's not a coincidence, and it's not your imagination.

The reason the time change hits women harder than men is real: our body clocks naturally run earlier, and the hormone rhythms that govern sleep and stress weaken in the second half of the cycle. So a single hour's shift can ripple through your sleep, your mood and your energy in a way it simply doesn't for the people around you.

The good news is that autumn is also the perfect moment to get ahead of it — before the deep-winter slump, while small changes still have room to work.

If you recognised yourself in one of these — or, let's be honest, in more than one — that's worth taking seriously rather than filing under "just tired." Working with your cycle and the season together, with support built around your actual pattern rather than a generic winter-wellness checklist, is exactly the kind of thing a registered herbalist can help you map out. Whether that's here in the Ribble Valley or online wherever you are, autumn is a good time to start. If you're not sure where to begin, take the two-minute quiz and it'll point you to the right first step.

Your body isn't failing you this season. It's asking for something different. This is a good week to listen.

Marie Mulcahy is a NIMH-registered Medical Herbalist (MNIMH) working with perimenopause, PCOS, endometriosis and PMDD, with clinics in Clitheroe and Darwen and online consultations UK-wide. This article is educational and not a substitute for individual medical advice — always check new or severe symptoms with your GP.