Hair loss and hair breakage are completely different problems — with completely different fixes. Here is how to tell which one you have.

In brief: Hair loss originates at the follicle — the strand sheds with a white bulb at the root. Hair breakage happens along the shaft — the strand snaps and produces short, irregular pieces without a bulb. Both lead to less visible hair, but they require completely different treatments. The white bulb test tells you which one you're dealing with in seconds — and getting it wrong means treating the wrong problem for months.

Most people use "my hair is falling out" to describe all three things: hair shedding from the root, hair snapping along the shaft, and gradual thinning of the strand diameter. These are not the same condition. Hair loss and hair breakage are distinct conditions that require different diagnostic and treatment approaches. While hair loss originates from the follicle and often reflects internal health factors, breakage is typically the result of external damage to the hair shaft. Early identification and targeted intervention play a crucial role in maintaining long-term hair health.

Using products designed for follicle-origin hair loss when the problem is shaft breakage wastes time and money. Spending months on strengthening treatments when the problem is telogen effluvium from iron deficiency delays the investigation that would actually identify the cause. The diagnosis has to come first.

How do you tell the difference between hair loss and breakage?

The simplest and most reliable method requires nothing more than looking at the strands you find in the brush, shower, or on your pillow.

Hair loss starts at the scalp and often includes strands with a white bulb at the root, while hair breakage occurs along the hair shaft and produces shorter, uneven pieces with no bulb.

What causes hair breakage?

Hair breakage happens when the hair shaft loses its strength. Common causes include excessive heat styling, chemical treatments, lack of moisture, mechanical stress, and environmental damage.

Can hair breakage cause hair loss?

Breakage does not directly cause follicle-origin hair loss — the two are mechanically distinct. However, they can create conditions that amplify each other. Traction from tight hairstyles that causes breakage can also, over time, cause traction alopecia — permanent follicle damage at the hairline, which we covered in the June article. Chemical processing that produces shaft breakage can also sensitise the scalp surface and contribute to the inflammatory environment that feeds PIILIF. Hard water mineral deposits that weaken the shaft also disrupt scalp pH and microbiome.

The distinction between breakage and follicle-origin loss is real and clinically important. But the lifestyle factors that cause breakage often also stress the scalp environment in ways that are relevant to follicle health. They are separate mechanisms that frequently share common causes.

Frequently Asked Questions

How can I tell if I have hair loss or hair breakage?

Look at the hairs you find in your brush or shower. Full-length hairs with a small white bulb at one end have shed from the follicle — this is hair loss or normal shedding. Short, irregular strands without a white bulb have snapped along the shaft — this is breakage. If you see both types, both problems are occurring simultaneously.

Does hair breakage grow back?

Yes — breakage does not damage the follicle. The follicle continues producing new hair normally; the problem is that the existing shaft is snapping before reaching full length. Once the cause of breakage is addressed (heat, chemicals, mechanical stress, hard water, porosity mismatch), new growth is undamaged and the overall appearance gradually improves as the damaged lengths are trimmed or grow out.

What does hair breakage look like?

Short, irregular strands in varying lengths — from a few centimetres to mid-shaft — without a white bulb at either end. Often found on pillowcases and in brushes rather than at the hairline. May produce what looks like lots of short flyaways around the crown or mid-lengths. The hair may feel dry, rough, or look dull compared to the lengths closer to the root.

What does hair loss look like?

Full-length or near-full-length strands with a white or pale club root at one end. Found in normal shedding (50-100 daily), with increase during telogen effluvium, and with patterned thinning in AGA. Hair loss shows as reduced density at the scalp level — visible scalp, widened parting, or receding — rather than the uneven lengths of breakage.

Can nutritional deficiency cause both hair loss and breakage?

Yes. Iron deficiency and protein deficiency both affect follicle cycling (causing telogen effluvium) AND shaft quality (weakening the keratin structure that gives the shaft its tensile strength). Someone with both low ferritin and inadequate cystine/methionine intake may have follicle-origin shedding AND shaft breakage simultaneously — the white bulb test will show both types in the brush.