What role does Östradiol play in fatigue?

Estradiol, the primary form of estrogen, influences fatigue through multiple pathways: it regulates mitochondrial function, energy metabolism, and neurotransmitters such as serotonin and dopamine. A decline in estradiol levels, as seen in perimenopause or after oophorectomy, is commonly associated with increased fatigue and reduced stamina. Cyclic fluctuations can also contribute to premenstrual exhaustion in some women. However, the evidence is not conclusive: while observational studies suggest a link, randomized controlled trials of hormone therapy for fatigue show mixed results. Individual factors like sleep quality, stress, and thyroid function play major roles. Hormone therapy is not recommended solely for fatigue due to risks such as thrombosis and breast cancer. Genetic variants in estrogen receptor genes (e.g., ESR1) may modulate sensitivity but are not clinically actionable. Overall, estradiol is a relevant but non‑exclusive contributor to fatigue; a comprehensive medical evaluation is warranted.