Growth Hormone Deficiency in Adults: Beyond the Basics

Physical Signs

GH deficiency leaves clear traces on the body. Pseudo-gynecomastia, droopy abdomen, or fatty cushions above the knees are frequent.

The face may show thinning eyebrows, sagging cheeks, droopy eyelids, and deep wrinkles. Even hands and nails can display atrophy and ridges, signaling deeper hormonal imbalance.

Laboratory Insights

Serum IGF-1 is the key marker, but results must be interpreted carefully. Patients in the “normal” range may still be functionally deficient, especially in the lower quartile.

The IGF-1/IGFBP-3 ratio better reflects bioavailable IGF-1. In older adults, reduced receptor number and affinity amplify the effects of even mild declines.

Psychological Dimension

GH deficiency often mimics psychiatric conditions. Patients report fatigue, poor stress tolerance, anxiety, or emotional instability.

Depression is frequent, linked to reduced nocturnal GH secretion. Overlap with chronic fatigue syndrome and fibromyalgia is strong, making careful assessment crucial.

Clinical Implications

Intermediate IGF-1 levels should not be dismissed. Taller and more muscular patients often require higher IGF-1 targets than smaller individuals.

Research shows that low IGF-1, even within reference ranges, correlates with higher risks of cardiovascular disease, osteoporosis, dementia, and some cancers. Recognizing these nuances can change outcomes.