warum bin ich immer müde — when to see a doctor?

Fatigue has many potential causes – poor sleep, stress, unbalanced diet, lack of exercise, but also medical conditions such as anemia, hypothyroidism, diabetes, depression, or chronic infections. The provided context does not contain specific genetic markers directly linked to general fatigue. While ferritin is mentioned as an iron storage protein, it is also an acute-phase reactant: inflammation can elevate ferritin independently of iron status. A standalone ferritin self-test without CRP is therefore not interpretable. The sport-related genes (ACTN3, PPARGC1A, ACE) relate to athletic performance and recovery, not everyday tiredness. Direct-to-consumer genetic tests for fatigue lack robust scientific evidence and are not endorsed by professional guidelines. When to see a doctor? If fatigue persists for several weeks, is accompanied by unexplained weight loss, fever, night sweats, shortness of breath, or significantly impairs daily functioning. A physician can order a complete blood count, iron panel, thyroid function, vitamin B12, vitamin D, and inflammatory markers – a far more comprehensive workup than any home test.