If you have ever lit a candle to relax and ended the evening with a dull headache, you are not imagining it and you are not alone. Why do candles give me a headache is one of the most common things people type into Google about candles, and the honest answer is more useful than the usual advice to just buy soy.
This guide explains what is actually happening, which parts of a candle matter, and how to choose and burn one so it stays clear. We make candles, so we have a point of view. We have tried to keep it honest.
Why do scented candles give some people a headache?
Most candle headaches come from two things: too much fragrance in the air, and smoke or soot from a wick that is burning badly. The wax type plays a part, but a heavily scented candle with a large wick will bother sensitive people no matter what it is made of.
Scent sensitivity is personal. Some people can sit next to a strong vanilla candle for hours. Others get a headache from the same candle in twenty minutes. If you are the second kind of person, the fixes below are for you.
Is it the wax or the scent?
Usually the scent, sometimes both. Fragrance is what you notice first, so a candle loaded with 10 to 12 percent fragrance oil in a small room is the most common cause. Wax matters less on its own, but paraffin burns with more soot than soy, and soot is a second irritant on top of the scent.
Here is the simple version of how a candle works. The flame melts a pool of wax, the wick draws the liquid wax up, and the heat releases the fragrance oil that was mixed into the wax when it was poured. Everything you smell, and everything that might bother you, comes out of that melt pool.
Does buying a soy candle fix it?
Not by itself. Soy wax candles burn cooler and cleaner than paraffin, with noticeably less soot, but a soy candle with a heavy fragrance load and an oversized wick can still fill a room faster than you want. Soy is a good starting point, not the whole answer.
What the word soy tells you is that the wax comes from soybean oil rather than from petroleum. What it does not tell you is how much fragrance is in the candle, what that fragrance is made of, or whether the wick is the right size for the jar. Those three things decide how the candle feels in a room.
What is fragrance load, and why does it matter more than the wax?
Fragrance load is the percentage of fragrance oil mixed into the wax. Many candles are poured at 8 to 12 percent because a strong first sniff sells in a shop. A candle at 6 percent smells clearly in the room you are in without pushing through the whole house.
More is not better here. Past a certain point the wax cannot hold the oil properly, the candle burns hotter, and the scent turns from pleasant to heavy. If a candle gives you a headache within the first half hour, fragrance load is the first thing to suspect.
Which candle scents are least likely to bother you?
Green and herbal scents such as eucalyptus, lavender, sage and clean cotton are generally lighter in the air than sweet scents such as vanilla, caramel and spice. If you are sensitive, start with a lavender candle or a eucalyptus candle and see how you feel before moving to warmer scents.
That is a tendency, not a rule. The way a scent is built matters as much as its name. A vanilla candle made with a restrained, well-made fragrance can sit more quietly than a cheap fresh linen one. Calming candle scents for the end of the day tend to be the ones that stay in the background rather than announce themselves.
If you want a place to start, this is the one we point sensitive friends to first. Eucalyptus and lavender over earthy woods, poured at 6 percent, in a size that suits a bedroom.
How do you burn a candle so it does not build up?
Keep the wick trimmed to about a quarter inch before every burn, burn for one to four hours at a time, light one candle per room, and give the room some air. A long wick makes a big flame, a big flame makes soot, and soot plus fragrance in a closed room is the classic headache.
Two more habits help. Let the first burn go long enough for the melted wax to reach the edge of the jar, so the candle burns evenly for the rest of its life instead of tunnelling and smoking. And stop lighting the candle when about half an inch of wax is left. The last of the wax burns hotter and dirtier than the rest.
Paraffin, soy and blends: what is the real difference?
| What to check | Paraffin | Soy | Coconut or soy blends |
|---|---|---|---|
| Where it comes from | Petroleum refining | Soybean oil | Coconut oil, often mixed with soy |
| Soot when burning | More, especially with a long wick | Less | Less |
| Burn temperature | Hotter | Cooler and slower | Cooler |
| Scent throw | Strong, can turn heavy | Clear, more even | Strong, can be very strong |
| What matters more than the wax | Fragrance load, fragrance quality and wick size, in that order | ||
If you take one thing from this table, take the last row. People argue about wax because it is printed on the front of the jar. The things that actually decide whether a candle bothers you are usually not printed anywhere, which is why it is worth buying from a maker who tells you.
What to look for on a label, in plain words
- The wax named clearly. 100% soy or coconut soy is a real statement. Premium wax blend is not.
- The fragrance load, if the maker will say it. Most will not. A maker who tells you the percentage is telling you they thought about it.
- The wick. Cotton or cotton-and-paper wicks with no metal core. Lead cores have been banned in the US for years, but zinc cores still turn up in cheap candles.
- A safety label on the base with burn instructions. It is a small sign of a maker who follows the standards.
- Burn time that matches the size. A 9 oz candle should give you 40 to 60 hours. A claim far above that usually means a thin wick and a weak scent.
What we do at Solstead
Our candles are poured with 100% natural soy wax made in the USA, a cotton-and-paper wick with no lead or zinc, and fragrance at 6 percent. That number is low on purpose. They are made for the last hour of the day, in the room you are sitting in, not for scenting a whole house. Everything we put in them is written out in one place, so you can check it against this article: What's in a Solstead candle.
We cannot promise that any candle, ours included, will never bother a sensitive person. What we can promise is that we chose the quiet setting on every dial we control. If you want to start light, Eucalyptus Lavender Herb and Clean Cotton are the two we would suggest first. Every scent and its notes are in the Scent Library.
Related questions
Can a candle headache be from the flame itself?
Rarely. A single candle flame produces very little heat or carbon monoxide in a normal room. The smoke and the fragrance are the usual suspects, and both are fixable.
Are unscented candles the only safe choice for sensitive people?
They are the simplest choice, but many sensitive people do fine with lightly scented soy candles at a modest fragrance load, burned for an hour or two with a trimmed wick. Try one candle, one room, one hour, and judge from there.
Does a bigger candle mean more fragrance in the air?
Yes, roughly. A larger melt pool releases more scent. If a 13.75 oz candle is too much for a small bedroom, a 4 oz or 9 oz size of the same scent will sit more quietly.
Why does my candle smell fine at first and then give me a headache?
Fragrance builds up in a closed room. The candle has not changed. The air has. Crack a window, or move to a shorter burn.