
diagnostizieren
to diagnose
To identify an illness or medical problem in a person by analyzing symptoms and examination results.
Der Arzt diagnostizierte bei ihm eine schwere Grippe.
The doctor diagnosed him with a severe flu.
to diagnose
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to diagnose
To identify an illness or medical problem in a person by analyzing symptoms and examination results.
Der Arzt diagnostizierte bei ihm eine schwere Grippe.
The doctor diagnosed him with a severe flu.

to diagnose
In a figurative sense, to analyze and name the cause of a problem in a non-medical context.
Die Unternehmensberatung diagnostizierte eine veraltete Managementstruktur als Hauptproblem.
The management consultancy diagnosed an outdated management structure as the main problem.
The verb 'diagnostizieren' (to diagnose) belongs to the noun 'die Diagnose' (the diagnosis). The ending '-ieren' often signals a verb borrowed from a foreign language. These verbs are always regular and form their past participle with '-t' ('diagnostiziert').
Die Diagnose des Arztes war eindeutig.
The doctor's diagnosis was clear.
The context shows which meaning is intended. In medical texts with words like 'Arzt' (doctor), 'Patient' (patient), or names of illnesses, it is about the medical diagnosis. In contexts such as 'Unternehmen' (company), 'System' (system), or 'Gesellschaft' (society), the figurative meaning is intended.
Der Techniker diagnostizierte einen Fehler in der Software.
The technician diagnosed an error in the software.
In medical contexts, the person in whom something is identified is often indicated with the preposition 'bei' and the dative. The illness itself is the accusative object.
Bei dem Patienten wurde eine seltene Allergie diagnostiziert.
A rare allergy was diagnosed in the patient.
In the figurative meaning, the things that are usually 'diagnostiziert' (diagnosed) are abstract negative things, for example problems, errors, weaknesses, or a cause.
Die Analyse diagnostizierte grundlegende Schwächen im System.
The analysis diagnosed fundamental weaknesses in the system.
to recognize / realize
Both words can refer to understanding that an illness is the cause. erkennen refers to a general realization about a situation, while diagnostizieren means making a medical determination after analyzing symptoms and examination results. Use diagnostizieren for this specific medical assessment.

Die Ärztin diagnostizierte anhand der Beschwerden eine Krankheit.
The doctor diagnosed an illness based on the symptoms.
An den Beschwerden erkannte ich, dass eine Krankheit dahinterstecken könnte.
From the symptoms, I realized that an illness might be behind them.