der Haarausfall
hair loss
The loss of hair, especially from the head, which leads to visible thinning of the hair or to baldness.
Viele Männer leiden unter erblich bedingtem Haarausfall.
Many men suffer from hereditary hair loss.

hair loss
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hair loss
The loss of hair, especially from the head, which leads to visible thinning of the hair or to baldness.
Viele Männer leiden unter erblich bedingtem Haarausfall.
Many men suffer from hereditary hair loss.

The word is a compound of 'Haar' (hair) and 'Ausfall' (loss/falling out). The part 'Ausfall' is derived from the separable verb 'ausfallen', which here means 'herausfallen' (to fall out).
Im Herbst fallen vielen Menschen vermehrt die Haare aus.
In autumn, many people lose more hair than usual.
To express being burdened by hair loss, you use the construction 'an Haarausfall leiden' or 'unter Haarausfall leiden' (to suffer from hair loss). Both are correct.
Sie leidet seit der Schwangerschaft an Haarausfall.
She has been suffering from hair loss since the pregnancy.
Common adjectives that describe 'Haarausfall' (hair loss) are 'erblich bedingt' (hereditary), 'hormonell bedingt' (hormonal), 'plötzlich' (sudden), or 'kreisrund' (patchy/circular). These words often indicate the cause or type of hair loss.
Stress kann zu plötzlichem Haarausfall führen.
Stress can lead to sudden hair loss.
bald head / bald spot
'die Glatze' and 'der Haarausfall' both have to do with missing hair on the head. 'Die Glatze' describes the result: the head is completely bald, or there is a bald spot. 'Der Haarausfall' describes the process or problem: hair is falling out. Learners may confuse the words because hair loss can lead to a bald head or bald spot. As a practical rule: when you see the condition, you are more likely to say 'Glatze'. When you are talking about losing hair, you say 'Haarausfall'.

Nach der Krankheit hatte meine Kollegin starken Haarausfall.
After the illness, my colleague had severe hair loss.
Seit dem Sommer trägt mein Onkel eine Glatze.
Since the summer, my uncle has had a bald head.