Seasonal hair loss in autumn: why it happens and what you can do about it.

Autumn brings change – in nature, in the light, in our skin and in our hair too. In October and November many people notice that more hair is left behind in the brush or the shower. What seems worrying at first is often a natural, seasonal process. But when is hair loss normal, when is there more to it, and what can you actually do about it?

Every single hair lives in cycles. During the so-called anagen phase it grows actively – this phase lasts two to six years. A short transition phase follows, before the hair enters the telogen phase, the resting phase in which it eventually falls out. Around 10% of our hair is in this resting phase at any time. In autumn this proportion often rises. Studies show that more hairs move into the telogen phase at the same time in late summer and autumn. The visible effect appears with a delay – so we usually notice the hair loss in October and November, although the cause lies weeks in the past.

So-called seasonal hair loss is no cause for concern – it shows that the hair cycle is working.

Seasonal hair loss, also called telogen effluvium, is a well-known phenomenon. The sun and the light in summer stimulate hair growth. As the days get shorter, light intensity falls – and with it the vitamin D level. At the same time the hormone balance changes: the body produces more melatonin, less oestrogen and fewer growth signals for the hair follicles. External factors add to this: dry heating air, temperature swings, hats that cause friction. All of this can make hairs that are already in the resting phase fall out more quickly. The good news: autumn hair loss is usually temporary. After a few weeks the hair cycle regulates itself – new hairs begin to grow, and density returns to normal.

Sometimes, however, there is more to it. Above-average hair loss over a longer period – more than about 100 hairs a day over several weeks – can be a sign of physical or hormonal causes. A noticeably thinning parting, bald patches or an itchy scalp are also signals that should be examined.

Possible cause

Description

Hormonal changes

Hair loss can occur after pregnancy, during the menopause or with thyroid problems.

Stress and lack of sleep

Raise cortisol, which weakens the hair root.

Nutrient deficiency

Iron, zinc, vitamin D and protein are essential for healthy hair growth.

Genetic factors

With hereditary hair loss (androgenetic alopecia), the hair follicles react more sensitively to dihydrotestosterone (DHT).

Scalp conditions

Inflammation, dandruff or fungal infections can disrupt hair growth.

Medication and illness

Certain medications or infections (e.g. after COVID-19) can trigger temporary diffuse hair loss.

If hair loss visibly changes density or lasts longer, the cause should be clarified medically – in most cases there is something treatable behind it.

While seasonal hair loss subsides on its own, regeneration can be supported with targeted measures. This is less about miracle products than about consistent, healthy routines.

1. Nutrition and micronutrients

Hair roots react sensitively to nutrient deficiencies. A protein-rich diet with enough iron, zinc, biotin and vitamin D supports growth. Vitamin D levels drop in autumn in particular – a deficiency can directly affect hair density. If you are unsure, a blood test with your doctor can provide answers.

2. Scalp care

A healthy scalp is the basis for strong hair. Use mild, sulphate-free shampoos and massage the scalp regularly to stimulate circulation. Serums with ingredients such as caffeine or peptides can also stimulate the hair follicles. Important: no aggressive products and no constant hot blow-drying – this irritates the scalp further.

3. Stress reduction and sleep

Chronic stress is one of the most common, underestimated triggers of diffuse hair loss. Make sure you get enough sleep, relaxation and exercise. Studies show that hair roots recover measurably when stress hormones fall.

4. Medical treatments

If hair loss is heavier or persistent, medical options can be worthwhile. These include topical preparations with minoxidil, PRP treatments (autologous blood therapy) or targeted hormone regulation. A specialist in dermatology or aesthetic medicine can advise you individually on which therapy makes sense.

For many people, hair loss in October and November is part of the natural rhythm. The body adjusts to the darker season, and this shows on the scalp too. As long as the loss stays moderate and no bald patches appear, this is perfectly normal. Anyone who looks after their scalp, reduces stress and eats a balanced diet supports the natural regeneration process in the best possible way. If the hair loss becomes heavier or lasts longer, however, a medical examination is worthwhile – to treat deficiencies, hormonal fluctuations or other causes in a targeted way. In the end: autumn is not the enemy of hair, but a phase of letting go and starting afresh – just as in nature.