Quick answer: fine hair describes the width of each individual strand: each hair is slim. Thin hair describes density: how many hairs you have on your head. You can have fine hair that's thick (lots of slim strands), coarse hair that's thin (fewer, wider strands), or hair that's both fine and thin. Fine hair needs lightweight, volumising care such as Volume Up Shampoo; weak, fragile hair benefits from strengthening care such as Fortifying Shampoo. If your hair has become noticeably thinner, speak to your GP.
"Fine" and "thin" get used as if they mean the same thing, but they describe two different things. Knowing which you have makes choosing products much easier.
Fine vs thin hair at a glance
| Fine hair | Thin hair | |
|---|---|---|
| What it describes | Width of each strand | Number of strands (density) |
| How it looks | Soft, silky, falls flat, gets greasy quickly | Scalp shows easily, ponytail feels small |
| Main challenge | Weighed down by heavy products | Lack of fullness |
| Care focus | Lightweight volume, lift at the roots | Gentle care, strength, styling for fullness |
How to tell if your hair is fine
- The strand test: pull out a single hair (or take one from your brush) and roll it between your fingers. If you can barely feel it, it's fine. If it feels like a piece of thread, it's medium; if it feels wiry, it's coarse.
- The signs: fine hair is often soft and silky, struggles to hold a curl or a style, and looks greasy faster because oil travels easily down slim strands.
How to tell if your hair is thin
- The parting test: part your hair in the middle. If you can see a lot of scalp along the parting, your hair is likely low density.
- The ponytail test: if your ponytail is noticeably small around (smaller than a 10p coin, as a rough guide), you probably have thin hair.
Some people are naturally low density; that's simply their hair type.
How to care for fine hair
- Wash with a lightweight volume shampoo. Volume Up Shampoo cleanses gently while adding body from root to tip, with organic ginseng, psyllium and white nettle extracts that help fine hair feel thicker and stronger along the lengths.
- Keep conditioner off the roots. Use a light one, such as Energizing Hair Conditioner, on the mid-lengths and ends only.
- Lift at the root. A root lotion before blow-drying and a texture product on dry roots add volume without weight. See volume spray vs root lotion vs texture powder.
- Skip heavy oils and butters on the roots. If your ends need it, use a few drops of a light serum.
More in how to make fine hair look thicker, or shop the Volumizing range.
How to care for thin hair
- Be gentle. Fewer strands means every one counts, so detangle from the ends up, avoid tight hairstyles and use heat protection.
- Strengthen weak, fragile hair. Fortifying Shampoo and the no-rinse Fortifying Hair Treatment (HAIR Awards 2024 winner) strengthen weak, fragile hair and leave the scalp feeling fresh. They're cosmetic care for the hair you have; they're not a hair-loss treatment.
- Style for fullness. Volumising products, a blow-dry with a round brush and a slightly shorter, blunt cut can all make thin hair look fuller.
- Look after your scalp. A clean, comfortable scalp is the best base for healthy-looking hair.
When is thin hair a sign of hair loss?
If your hair has always been this way, it's simply your hair type. But if it has become noticeably thinner, you're shedding much more than usual, or you have patches, a widening parting or a receding hairline, speak to your GP. Hair loss can have many causes, including hormones, iron levels, stress and illness, and a GP can help find out why. You may also find our guides to seasonal hair shedding, menopause hair changes and hair breakage helpful. We don't make claims that any product grows hair.
Frequently asked questions
Can you have fine and thick hair?
Yes. Fine describes each strand, thick describes how many you have. Lots of slim strands is fine, thick hair.
Is fine hair the same as thin hair?
No. Fine is the width of each hair; thin is the number of hairs. You can have one, the other, or both.
What's the best shampoo for fine hair?
A lightweight volumising shampoo that doesn't leave residue, such as Volume Up Shampoo.
Does volume shampoo make hair thicker?
It makes hair look and feel fuller by adding body and lift. It doesn't change the number of hairs you have.
Should I cut fine or thin hair short?
Not necessarily, but blunt ends and a length that suits your hair's density usually look fullest. Ask your hairdresser.
About the author
Charlotte Read has spent six years in the hair industry with Insight Professional and holds a First Class BSc in Business Management and Marketing. She writes with reference to real salons across social media and the wider Insight community, and draws on the Insight office team, who between them bring over 100 years of combined experience on salon floors.
Where technical expertise is needed, Charlotte consults Lorraine Matic, Head of Insight UK Education, who brings over 38 years of global experience in colour, technique and hair science.