was ist cortisol einfach erklärt — when to see a doctor?

Cortisol is a vital hormone produced by the adrenal glands. It regulates metabolism, blood sugar, blood pressure, and immune response. Often called the 'stress hormone,' it is released during acute stress – which is beneficial short-term. However, chronically elevated levels can lead to sleep disturbances, weight gain, hypertension, and a weakened immune system. You should see a doctor if you experience persistent fatigue, unexplained weight changes, muscle weakness, mood swings, or significant hair loss over weeks or months. Also seek medical advice if you suspect Cushing's syndrome (overproduction) or Addison's disease (underproduction). Diagnosis involves saliva, blood, or urine tests. Important: single measurements are often inconclusive because cortisol follows a circadian rhythm. The provided context does not contain specific studies on cortisol; this answer is based on general medical knowledge.