Adson's Test for Thoracic Outlet Syndrome - Physical Therapy Web

1. Dark Knuckles Possible causes: • Insulin resistance / early sign of diabetes • Vitamin B12 deficiency • Hormonal imbalance (PCOS, thyroid) • Friction or pigmentation due to dryness or manual work 👉 If accompanied by fatigue, weight gain, or dark neck, get blood sugar and thyroid checked. ⚡ 2. Tingling in Hands Possible causes: • Vitamin B12 deficiency (common if vegetarian) • Nerve compression (like carpal tunnel syndrome) • Poor blood circulation • Electrolyte imbalance (low calcium, potass