das Nasenbluten
nosebleed
The discharge of blood from the nose, also called epistaxis in medical terminology.
Wegen der trockenen Luft im Winter bekomme ich oft Nasenbluten.
Because of the dry air in winter, I often get nosebleeds.

nosebleed
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nosebleed
The discharge of blood from the nose, also called epistaxis in medical terminology.
Wegen der trockenen Luft im Winter bekomme ich oft Nasenbluten.
Because of the dry air in winter, I often get nosebleeds.

The word is made up of 'Nase' (nose) and the nominalized verb 'das Bluten' (bleeding). So it literally describes bleeding from the nose.
Nach dem Stoß hatte er leichtes Nasenbluten.
After the bump, he had a slight nosebleed.
The second part of the word, 'Bluten' (bleeding), is a nominalized verb. Such nouns are always neuter in German, which explains the article 'das'. They are almost always used only in the singular.
Das ständige Bluten der Wunde musste gestoppt werden.
The constant bleeding of the wound had to be stopped.
The most common verbs for talking about 'Nasenbluten' (nosebleed) are 'haben' (to have) and 'bekommen' (to get). So you say 'Ich habe Nasenbluten' (I have a nosebleed) or 'Ich habe Nasenbluten bekommen' (I got a nosebleed).
Als Kind hatte ich sehr oft Nasenbluten.
As a child, I had nosebleeds very often.
bleeding
'die Blutung' and 'das Nasenbluten' both describe blood coming out of the body. 'Blutung' is the general term and can occur anywhere in the body, visibly or internally. 'Nasenbluten' is much more specific: it only means that blood is coming from the nose. The words can be confused because a nosebleed is a type of bleeding. When it is clear that the nose is meant, 'Nasenbluten' sounds more natural. When the location is not important or you are talking about an injury in general, 'Blutung' fits better.

Im Bus bekam ein Kind plötzlich Nasenbluten und hielt ein Taschentuch an die Nase.
On the bus, a child suddenly got a nosebleed and held a tissue to his nose.
Die Ärztin kontrolliert die Blutung, weil die Wunde ziemlich tief ist.
The doctor checks the bleeding because the wound is quite deep.