leidet

In a sentence

• Er leidet an einer seltenen Krankheit.

  He suffers from a rare disease.

  Here, 'leidet' is used to describe the experience of suffering or being affected by a condition, specifically a medical one, denoted by the use of 'an' (dativ).

• Sie leidet unter starkem Stress bei der Arbeit.

  She suffers from severe stress at work.

  In this case, 'leidet' expresses an enduring experience of stress or hardship, typically emotional or situational in nature, highlighted by 'unter' (dativ).

• Das Unternehmen leidet unter den wirtschaftlichen Problemen.

  The company is struggling with economic problems.

  Here, 'leidet' metaphorically refers to the company experiencing difficulties or hardship due to external economic factors, again using 'unter' (dativ).