medizinisch
medical
Relating to medicine as a science or practice; concerning the practice of healing.
Nach dem Unfall benötigte er sofort eine medizinische Behandlung.
After the accident, he needed immediate medical treatment.

medical
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medical
Relating to medicine as a science or practice; concerning the practice of healing.
Nach dem Unfall benötigte er sofort eine medizinische Behandlung.
After the accident, he needed immediate medical treatment.

The adjective 'medizinisch' (medical) is derived directly from the noun 'die Medizin' (medicine). It describes anything that has to do with the practice of healing.
Er studiert Medizin, um später als Arzt zu arbeiten.
He is studying medicine so he can work as a doctor later.
'Medizinisch' (medical) is very often combined with certain nouns. Common combinations are 'medizinische Versorgung' (medical care), 'medizinisches Personal' (medical staff), 'medizinischer Notfall' (medical emergency), and 'medizinische Fakultät' (medical faculty).
In einem medizinischen Notfall muss man schnell handeln.
In a medical emergency, you have to act quickly.
The phrase 'aus medizinischen Gründen' (for medical reasons) is a fixed expression. It is used to explain that an action or decision is necessary because of a health problem.
Er darf aus medizinischen Gründen keinen Zucker essen.
For medical reasons, he is not allowed to eat sugar.
health-related
'medizinisch' and 'gesundheitlich' are close in meaning because both can have to do with illness, treatment, or health. Use 'medizinisch' when something is about medicine, doctors, examinations, or treatments. 'gesundheitlich' is broader and generally refers to the state of someone's health or effects on health. Learners can easily confuse the words because a medical problem is often also a health-related problem. If you mean a treatment or diagnosis, 'medizinisch' fits better; if you are talking generally about a person's health, 'gesundheitlich' sounds more natural.

Die Ärztin erklärt den medizinischen Befund in einfachen Worten.
The doctor explains the medical findings in simple words.
Wegen gesundheitlicher Probleme arbeitet mein Vater nur noch halbtags.
Because of health problems, my father now only works part-time.