Why hair falls out: causes in men and women

Why hair falls out: the short answer

Hair falls out, first of all, because it renews itself: each hair goes through a cycle of growth, rest and shedding, and losing some every day is normal. Shedding becomes a problem when it speeds up or new hair grows back finer, and its most common causes are genetics, hormonal changes, stress and nutritional deficiencies.

In this guide we explain how to tell normal shedding from hair loss that deserves attention, the most common causes in men and in women, the factors that affect both, and when it is time to ask a professional for help.

How much hair is normal to lose per day

Losing between 50 and 100 hairs a day is considered part of the natural hair renewal cycle. Those hairs are replaced by new ones, so overall density does not change.

It is worth paying attention when, for several weeks, you notice much more hair than usual on your pillow, in your brush or in the shower drain, when your parting looks wider, or when areas with less density appear, such as the temples or the crown. Recognising that difference early lets you seek advice sooner and act with better information.

Most common causes of hair loss in men

In men, the most common cause is androgenetic alopecia, which is hereditary and linked to the sensitivity of hair follicles to dihydrotestosterone (DHT). It usually shows up as progressive thinning at the temples and the crown. If you want to understand it in depth, read our complete guide to androgenetic alopecia.

Genetics is joined by other factors that can speed up shedding or make hair look weaker: ongoing stress, a diet low in micronutrients, lack of sleep, some medicines and certain illnesses. So even when there is a family predisposition, habits also influence how your hair looks.

Most common causes of hair loss in women

In women, hair loss is usually diffuse rather than localised and closely linked to hormonal changes: the postpartum period, menopause, thyroid disorders, or starting or stopping hormonal contraceptives.

Chronic stress, very restrictive diets and low iron are also common triggers. Unlike many men, women rarely go completely bald, but they can lose density and thickness, which visibly reduces volume. In many cases, such as after giving birth, the shedding is temporary and hair recovers over time.

Factors that affect men and women alike

Beyond sex, there are common causes worth reviewing: physical or emotional stress, diet, styling habits and the condition of your scalp. Intense stress, for example, can cause diffuse shedding a few months after the episode that triggered it; we explain this in detail in our article on stress and hair loss.

Nutrition matters too. Biotin and zinc contribute to the maintenance of normal hair, as does selenium. A varied diet that includes protein, fruit, vegetables, pulses and nuts is the foundation. Very tight hairstyles, excessive heat from straighteners and hairdryers, or harsh dyes can damage the hair fibre and increase breakage, which is often mistaken for hair loss.

When to see a dermatologist

See a dermatologist or doctor if hair loss is intense or sudden, comes out in clumps or in round patches, or comes with itching, flaking, pain or redness on the scalp. Do the same if you notice other symptoms, such as persistent tiredness or unexplained weight changes.

A specialist can examine your scalp, order blood tests if needed (for example, iron or thyroid) and recommend the right approach for your case. Ideally, have that consultation before starting any product on your own, especially if the hair loss is abrupt.

How to care for your hair day to day

A simple, consistent routine is more useful than switching products every week. Use a gentle shampoo that respects your scalp, massage with your fingertips instead of scrubbing with your nails, avoid very hot water and limit heat styling and tight hairstyles.

If your diet is not always balanced, a food supplement can offer support, but never replaces a varied diet. There are formulas designed for each sex, such as Xpecia Hombre and Xpecia Mujer, which contain biotin and zinc, nutrients that contribute to the maintenance of normal hair. Keep in mind that the hair cycle is slow: any change in how your hair looks is measured in months, not days.

Frequently asked questions about why hair falls out

How many hairs a day is it normal to lose?

Losing between 50 and 100 hairs a day is considered normal, because they are part of the natural hair renewal cycle and are replaced by new ones. It is worth paying attention if, for several weeks, you notice much more hair than usual on your pillow, in your brush or in the shower, or if thinner areas appear.

Why do men lose more hair than women?

Because androgenetic alopecia is very common in men. It is hereditary, linked to the sensitivity of hair follicles to DHT, and usually affects the temples and crown. In women, hair loss tends to be more diffuse, linked to hormonal changes, stress or low iron, and rarely leads to complete baldness.

Can stress make your hair fall out?

Yes. An episode of intense physical or emotional stress can cause diffuse shedding, which usually appears a few months after that episode. In many cases it is temporary and hair recovers once the situation improves. If the hair loss is intense or does not settle, it is advisable to see a dermatologist or doctor.

What vitamins and minerals does hair need?

Biotin and zinc contribute to the maintenance of normal hair, as does selenium. Ideally, you should get them from a varied diet with protein, fruit, vegetables, pulses and nuts. A food supplement can offer support, but it should never replace a varied and balanced diet or a healthy lifestyle.

When should I see a dermatologist about hair loss?

See a dermatologist if hair loss is intense or sudden, comes out in clumps or round patches, or comes with itching, flaking, pain or redness. Do the same if you notice other symptoms, such as persistent tiredness. A specialist can order tests, for example for iron or thyroid, and guide you according to your case.