aufsuchen
to visit
To deliberately visit a person or place, often for a specific reason such as advice, help, or an official matter.
Bei starken Schmerzen sollten Sie einen Arzt aufsuchen.
If you have severe pain, you should visit a doctor.

to visit / to seek out
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to visit
To deliberately visit a person or place, often for a specific reason such as advice, help, or an official matter.
Bei starken Schmerzen sollten Sie einen Arzt aufsuchen.
If you have severe pain, you should visit a doctor.

'Aufsuchen' is a separable verb. The prefix 'auf-' goes at the end of the sentence in a main clause.
Wegen meiner Rückenschmerzen suche ich morgen einen Spezialisten auf.
Because of my back pain, I am going to see a specialist tomorrow.
'Aufsuchen' belongs to a more formal register. It is used when you visit a place or person for a specific, often serious or official reason.
Sie mussten das zuständige Amt aufsuchen, um den Antrag zu stellen.
They had to visit the responsible office in order to submit the application.
This verb is often combined with people or institutions from whom you hope to get help or a service. Typical phrases are: 'einen Arzt aufsuchen' (to see a doctor), 'einen Anwalt aufsuchen' (to consult a lawyer), 'eine Praxis aufsuchen' (to visit a medical practice), or also 'die Toilette aufsuchen' (to visit/use the toilet).
Bei rechtlichen Fragen ist es ratsam, einen Anwalt aufzusuchen.
For legal questions, it is advisable to consult a lawyer.
to find
'finden' and 'aufsuchen' can be confused because both have to do with searching or with a goal. 'finden' describes discovering something or someone, often after a search or by chance. 'aufsuchen', on the other hand, usually means that you deliberately go to a place or to a person, often for help, advice, or an appointment. In a more formal meaning, 'aufsuchen' can also mean to specifically search for and find someone or something. In everyday life, however, the important point is: you do not 'finden' the doctor when you have an appointment; you 'sucht den Arzt auf' (visit the doctor).

Wegen der starken Schmerzen hat Paul am Nachmittag eine Ärztin aufgesucht.
Because of the severe pain, Paul visited a doctor in the afternoon.
Aylin findet in der Pause einen ruhigen Platz zum Lernen.
During the break, Aylin finds a quiet place to study.