What to watch with SHBG and fatigue?

SHBG (sex hormone-binding globulin) is a carrier protein for sex hormones like testosterone and estrogen. In the context of fatigue, altered SHBG levels can be a clue to underlying metabolic or hormonal issues. Low SHBG is often linked to insulin resistance, metabolic syndrome, and fatty liver—conditions that can contribute to fatigue. High SHBG may indicate hyperthyroidism, liver disease, or estrogen excess. However, SHBG alone is not a direct marker for fatigue; the evidence is based on clinical observation and association studies, not RCTs. Interpretation requires a full panel (e.g., free testosterone, TSH, fasting insulin, liver enzymes). Consumer tests have limited predictive value and should not replace medical evaluation. Fatigue is multifactorial; SHBG is just one piece of the puzzle.