
stressen
to stress out
To put someone under pressure, cause them stress, or make them nervous.
Die ständigen Termine und die viele Arbeit stressen mich sehr.
The constant appointments and all the work really stress me out.
to stress out / annoy
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to stress out
To put someone under pressure, cause them stress, or make them nervous.
Die ständigen Termine und die viele Arbeit stressen mich sehr.
The constant appointments and all the work really stress me out.

to stress oneself out
To put oneself under pressure or worry unnecessarily.
Stresse dich nicht wegen der Prüfung, du bist gut vorbereitet.
Don't stress yourself out about the exam; you're well prepared.

to annoy
Colloquial for to annoy or bother.
Kannst du bitte aufhören zu stressen? Ich versuche, mich zu konzentrieren.
Can you please stop annoying me? I'm trying to concentrate.
The verb 'stressen' (to stress out) is a relatively modern word in German and was derived directly from the English word 'stress'. It is very common in everyday language.
Lass uns das Thema wechseln, das stresst mich nur.
Let's change the subject; it just stresses me out.
It is important to distinguish: 'jemanden stressen' (to stress someone out) means that an external thing or person causes stress. 'Sich stressen' (to stress oneself out) means that you put yourself under pressure.
Der Lärm von der Baustelle stresst die Anwohner.
The noise from the construction site stresses out the residents.
In the meaning of 'nerven' (to annoy) or 'stören' (to bother), 'stressen' (to annoy) is used mainly in informal colloquial speech. In formal contexts, you would use other verbs.
Stress hier nicht so rum, ich brauche meine Ruhe!
Stop being so annoying here; I need some peace and quiet!
to annoy
Nerven and stressen can both describe a negative effect on a person. Nerven mainly means that something persistently bothers or irritates someone, while stressen emphasizes pressure or mental strain. Nerven is suitable for irritating repetition; for tight deadlines or a heavy burden, stressen is more appropriate.

Die vielen Aufgaben mit derselben Frist stressen mich vor dem Abendessen.
The many tasks with the same deadline stress me out before dinner.
Die ständigen Nachrichten in der Gruppe nerven mich beim Abendessen.
The constant messages in the group annoy me during dinner.