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How are mental illnesses defined?

The complicated world of mental health

How are mental illnesses defined?
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StarsInsider
04/11/2026 10:00 ‧ 1 hour ago | StarsInsider

HEALTH

Psychology

What makes a mental illness different from an ordinary emotional struggle? While everyone experiences sadness, anxiety, or stress, determining when these feelings become a diagnosable condition is far more complicated than anyone might expect.

Mental health professionals rely on established guidelines to recognize patterns of symptoms and understand how they affect everyday life. But how, exactly, are mental illnesses defined? And what separates a mental health condition from a normal part of being human? Read on to find out.

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