Fatigue is a deep, persistent exhaustion that often includes sudden 'crashes' of energy, disrupted sleep quality, and difficulty feeling refreshed even after rest. It's common when hormonal health is compromised, as hormones directly affect energy production, stress response, and sleep cycles. Some key hormonal causes can include thyroid dysfunction (hypothyroidism), adrenal stress, and imbalances seen in conditions like PCOS or perimenopause. This type of fatigue can correlate with disrupted cortisol patterns, blood sugar instability, and nutrient depletion that accompanies heavy cycles or chronic stress. If you are experiencing unexplained, long-term fatigue, especially with cyclical patterns, it is essential to seek a diagnosis from a qualified healthcare provider.