ärztlich
medical
Relating to a doctor, medicine, or the practice of the medical profession.
Nach dem Unfall benötigte er sofortige ärztliche Hilfe.
After the accident, he needed immediate medical help.

medical
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medical
Relating to a doctor, medicine, or the practice of the medical profession.
Nach dem Unfall benötigte er sofortige ärztliche Hilfe.
After the accident, he needed immediate medical help.

The adjective 'ärztlich' (medical) is derived directly from the noun 'der Arzt' (doctor). The ending '-lich' turns the noun into an adjective meaning 'relating to a doctor' or 'coming from a doctor'.
Er arbeitet im ärztlichen Dienst eines großen Unternehmens.
He works in the medical service of a large company.
'Ärztlich' (medical) is almost always used in fixed combinations with certain nouns. The most common are 'ärztliche Hilfe' (medical help), 'ärztliche Behandlung' (medical treatment), 'ärztliches Attest' (doctor's certificate), and 'ärztliche Untersuchung' (medical examination).
Für die Versicherung brauche ich ein ärztliches Attest.
I need a doctor's certificate for the insurance.
This word belongs more to formal and official language. It is often found in documents, reports, or conversations about medical necessities.
Alle Mitarbeiter müssen sich einer ärztlichen Kontrolle unterziehen.
All employees must undergo a medical check-up.
medical
'medizinisch' and 'ärztlich' can both have to do with medicine and treatment. 'medizinisch' is more general and refers to medicine as a field or to treatment for health-related reasons. 'ärztlich' emphasizes more strongly that a doctor is involved, or that a doctor recommends, prescribes, or carries something out. The words are easily confused because many medical things are also doctor-related. But not everything medical comes directly from a doctor, for example 'medizinische Forschung' (medical research) or 'medizinische Geräte' (medical devices). For a certificate, recommendation, or check-up by a doctor, 'ärztlich' is more precise.

Für den Sportkurs braucht ihr eine ärztliche Bescheinigung.
For the sports course, you need a doctor's certificate.
Nach dem Unfall war eine medizinische Behandlung nötig.
After the accident, medical treatment was necessary.