How are TSH and Müdigkeit related?

TSH (thyroid-stimulating hormone) is produced by the pituitary gland and regulates thyroid function. Elevated TSH typically indicates hypothyroidism (underactive thyroid), which commonly causes fatigue, low energy, and lethargy. Low TSH may indicate hyperthyroidism (overactive thyroid), which can also lead to fatigue, often accompanied by restlessness and sleep disturbances. This relationship is well-established in clinical medicine, but individual symptom severity varies. The provided context does not contain direct studies or guidelines on TSH and fatigue, so this answer is based on general medical knowledge. Note: Persistent fatigue warrants a medical evaluation of thyroid function (TSH, fT3, fT4) and other potential causes.