If you feel worse in the fall every single year, the season is probably not the problem. The air in your house is. When the windows close and the furnace comes on, everything in your home that puts something into the air stays in the air. The exposure did not change much. The ventilation did. Same pile of stuff, a much smaller room to put it in.
That is usually the whole explanation for the headaches that come back in October, the mornings that start stuffy, and the wall you hit at three in the afternoon.
Key Takeaways
- If you feel worse in the fall, the most common reason is reduced ventilation, not the cold itself. Closed windows concentrate whatever is already in your indoor air.
- The first time the furnace runs, it pushes months of settled dust through the ductwork and into every room.
- Fragranced products are a real inhaled exposure, not a preference. The American Lung Association lists headaches, dizziness, eye, nose and throat irritation, coughing and wheezing among reported effects.
- Sensitivity can develop after years of using a product with no trouble at all, which is why almost nobody connects their symptoms back to the house.
- GGT, a liver marker on a standard metabolic panel, is worth a look. A functional range of 10 to 30 is tighter than most lab ranges, and a low reading is not automatically good news.
Why do I feel worse in the fall every year?
Because the air stops moving. Three things stack up in the same few weeks, and they all point in the same direction.
The windows close. All summer, whatever came off your cleaning products, your laundry, your candles and your furniture was diluted constantly by outside air moving through the house. In October that stops.
The furnace runs for the first time. That first burn sends a summer of settled dust out of the ducts and into the rooms you sit in.
Everyone moves indoors. More cooking, more cleaning, more time in the same sealed space, and the fall candles and plug-ins come out of the cupboard.
None of that is a new exposure. It is the same exposure in a smaller volume of air, hitting you for more hours a day.
Is it really the candles and cleaning products, or is that overblown?
It is real, and it is measurable. Fragranced products give off volatile organic compounds, which is the plain way of saying the scent gets into the air you are breathing and does not just disappear. The American Lung Association notes that fragrances affect indoor air quality and that reported symptoms include headaches, dizziness, irritation of the eyes, nose and throat, coughing and wheezing.
Burning things makes it more concentrated. Research coverage on home fragrance has reported that in poorly ventilated rooms, peak fine particle levels from scented candles can climb many times above World Health Organization guidance, and that it takes a while for those levels to settle back down when there is nowhere for the air to go. Flame-free products are not automatically clean either. Scented wax melts release compounds that react with indoor ozone and form new particles.
This is not an argument that you have to throw everything out. It is an argument that the pile is bigger than most women realize, and that the pile gets harder for the body to keep up with the moment the windows shut.
Why has nobody connected my symptoms to my own house?
Because the timeline does not look suspicious. You have used that detergent for a decade. You have burned that same candle every winter since your first apartment.
Sensitivity does not always show up the first time. It can develop after years of an exposure your body handled without complaint, which makes the trigger genuinely hard to find. Clinicians who work in this area describe exactly that pattern.
So when the headaches start in October, the last thing you suspect is the thing you have been doing for eleven years without a problem. You suspect the weather. Or your hormones. Or yourself.
What does GGT on my bloodwork have to do with this?
GGT is a liver marker that sits on a standard comprehensive metabolic panel, so you have almost certainly had it run without anyone mentioning it. Standard reference ranges for women commonly run up into the high thirties or forties, and they vary from lab to lab. Functionally, I want to see GGT sitting between 10 and 30.
GGT climbs when the liver is working against oxidative stress or a chemical load. That part is not controversial.
Here is the part that is worth knowing. A low GGT is usually reported as good news and left alone. But GGT is tied to how the body handles glutathione, the antioxidant system the liver leans on for this work. A reading on the low end can reflect a depleted supply rather than an easy workload. Low on the tool, not low on the job.
I will be straightforward about this: most conventional guidance treats a low GGT as nothing to think about. I read it differently, and I want you to know that before you bring it up somewhere and get a shrug.
Either way, one number never settles anything. I read GGT next to AST and ALT and the rest of the panel, because a single marker does not tell you what is happening. It tells you where to look next.
What can I actually do about it this week?
Start with air, not products. This is the cheapest and fastest lever you have.
Open two windows on opposite sides of the house for ten minutes a day, even in winter. Cross ventilation moves far more air than one window does, and ten minutes does not meaningfully cool the house down.
Run the bathroom and kitchen fans and let them run longer than feels necessary. Change the furnace filter now rather than in December.
Then pick one product. Not ten. The one you use most, every day, usually laundry detergent or whatever you clean the kitchen with. Swap it for an unscented version and give it three weeks.
And if you have been working at your health for a year and nothing is holding, look at the room. I have never been able to support somebody around an exposure that is still happening every day. If there is mold in the basement or a problem at work, no amount of support makes up for standing in it for eight hours. Remove what you can, even partly, and the rest has somewhere to land.
When should I see a doctor about this?
If you have shortness of breath, chest tightness, wheezing that is new or getting worse, or symptoms that came on suddenly and severely, get seen. A carbon monoxide detector is not optional in a house with a furnace, and a headache plus nausea plus grogginess that only happens at home and improves when you leave is worth ruling out properly and quickly.
Nothing here diagnoses or treats anything. This is education about a pattern, so you have better questions to ask.
Where to go from here
You are not imagining the fall pattern, and you are not failing at your health because the same routine stopped working in October. The load went up in the same space while your body kept doing the same job it was already doing.
Start with the windows. Then look at one product. Then, if you want to see what your own panel has been telling you, the food side of this matters more than most people are told, and I put the list together for free.
Grab the free Root Cause Healing Foods plan here.