What to watch with TSH Schilddrüse and fatigue?

The question about TSH and fatigue is clinically relevant, but the provided context contains no specific information on this topic. TSH (thyroid-stimulating hormone) is a key marker of thyroid function. Elevated TSH suggests hypothyroidism, which commonly causes fatigue, lethargy, and weight gain. Low TSH may indicate hyperthyroidism, which can also cause fatigue along with anxiety and palpitations. Evidence for a direct genetic influence on TSH and fatigue is weak: individual SNPs (e.g., in PDE8B or CAPZB) show only small effects in GWAS and are not clinically actionable. Fatigue has many causes (iron deficiency, sleep disorders, stress, depression). A DNA test alone cannot replace clinical evaluation with blood tests (TSH, fT3, fT4, antibodies). The SNPs mentioned in the context (rs662799 for lipids, COMT, TCF7L2) are unrelated to thyroid function. Conclusion: Persistent fatigue with abnormal TSH requires medical workup; genetic tests do not provide reliable guidance here.