Seasonal hair loss: do you really shed more hair in the autumn?

A common observation

Many people notice that they shed more hair during certain periods of the year, often in the autumn. That leads some to fear that their hair loss has got worse. But is there anything in seasonal hair loss, or is it imagination?

What the research suggests

There is in fact evidence that hair loss can vary with the season. Some studies suggest that a larger proportion of hairs are in the resting phase (telogen) in late summer, which can lead to increased shedding some months later, typically in the autumn. That would explain the widespread experience of more hair in the brush during that period.

Why does it happen?

The precise mechanisms are not fully understood, but they are thought to be connected with natural, seasonal rhythms in the body, possibly influenced by light and temperature, rather as many mammals shed their coats seasonally. So it is probably a normal, biological variation rather than a sign of a problem.

Normal rather than worrying

The important message is that a mild, temporary increase in shedding at a particular time of year is usually entirely normal. The hair that is shed is typically replaced by new hair, and the total amount of hair stays stable across the year. There is rarely reason for concern or treatment for this natural variation.

When is it not just the season?

Seasonal variation should be mild and temporary. If you experience heavy, persistent hair loss, a clear and lasting thinning, bald patches or loss that continues beyond a single season, it is probably not just the time of year. You should then see a doctor to have it assessed for another cause such as hereditary loss, telogen effluvium or a deficiency.

Put it in perspective

It is normal to lose 50-100 hairs a day, and that this amount can naturally fluctuate a little across the year. Noticing a little more hair in the drain during an autumn month is rarely a sign of incipient baldness. Stay calm, and only react if the loss is heavy, persistent or accompanied by other signs.

Conclusion

There is genuine evidence that hair loss can vary with the season, with increased shedding for many in the autumn: probably a normal biological rhythm rather than a problem. A mild, temporary increase is usually entirely normal. Do see a doctor, though, if the loss is heavy, persistent or accompanied by thinning or bald patches. This article is for general information and does not replace an individual medical assessment.

Seasonal shedding is one pattern among several described under causes of hair loss.