
der Wirbel
vertebra
One of the bones that make up the spine of humans and vertebrates.
Nach dem Sturz hatte sie Schmerzen im dritten Lendenwirbel.
After the fall, she had pain in her third lumbar vertebra.
vertebra / swirl
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vertebra
One of the bones that make up the spine of humans and vertebrates.
Nach dem Sturz hatte sie Schmerzen im dritten Lendenwirbel.
After the fall, she had pain in her third lumbar vertebra.

to cause a stir
To cause great excitement, bustle, or a lot of fuss about a person or thing.
Die Presse machte einen riesigen Wirbel um die Affäre des Politikers.
The press caused a huge stir over the politician's affair.

swirl / vortex
A fast, circular movement of air, water, dust, or something similar.
Das abfließende Wasser bildete einen kleinen Wirbel über dem Abfluss.
The draining water formed a small swirl above the drain.

tuning peg
A peg on a string instrument such as a violin or guitar, used to adjust the tension and therefore the pitch of a string.
An der alten Geige war ein Wirbel locker, weshalb sie sich ständig verstimmte.
On the old violin, one tuning peg was loose, which is why it kept going out of tune.

drumroll
A rapid sequence of beats on a drum, often used to increase suspense.
Der Zirkusdirektor kündigte die nächste Nummer mit einem lauten Wirbel auf der Trommel an.
The circus director announced the next act with a loud drumroll.
All meanings of 'Wirbel' are connected to the verb 'wirbeln' (to whirl), which means 'sich schnell drehen' (to spin quickly). A 'Wirbel' is either a rotating movement, something that rotates, or the excitement that arises from it.
Der Wind ließ die trockenen Blätter durch die Luft wirbeln.
The wind made the dry leaves whirl through the air.
The context makes the meaning of 'Wirbel' clear. In a medical context, it is a bone; in nature, a rotating movement; in the media, excitement; and in music, a part of an instrument or a drumbeat.
Der Arzt erklärte mir die Funktion der Halswirbel.
The doctor explained the function of the cervical vertebrae to me.
In the anatomical sense, 'Wirbel' is often used in compound words to specify the part of the spine. Typical examples are 'Halswirbel' (cervical vertebra), 'Brustwirbel' (thoracic vertebra), and 'Lendenwirbel' (lumbar vertebra).
Viele Menschen haben Probleme mit den Lendenwirbeln.
Many people have problems with their lumbar vertebrae.
The meaning 'Aufregung' (excitement/fuss) is almost always used in the fixed expression 'Wirbel machen' (to cause a stir) or 'Wirbel um etwas machen' (to make a fuss about something). The verb here is always 'machen' (to make/do).
Warum machst du wegen so einer Kleinigkeit so einen Wirbel?
Why are you making such a fuss over such a small thing?
In a musical context, a 'Wirbel' is a rapid sequence of beats on a drum. People often speak of a 'Trommelwirbel' (drumroll) to create suspense.
Vor der Verkündung des Gewinners gab es einen langen Trommelwirbel.
Before the winner was announced, there was a long drumroll.
excitement / commotion
Aufregung refers to the commotion or public interest following an event. Wirbel more strongly suggests the great deal of attention and bustle that arise or are created around a person or thing. When the exaggerated reaction surrounding something is the focus, Wirbel is the better fit.

Die Zeitung machte viel Wirbel um die überraschende Meldung.
The newspaper made a big fuss about the surprising announcement.
Die überraschende Meldung sorgte im Büro für große Aufregung.
The surprising announcement caused a great deal of commotion at the office.