Other causes of cold extremities are hypothyroidism, eating disorders like
anorexia, Vit B12 deficiency, Addison’s
disease, adrenal causes like pheochromocytoma, anemia, Buerger’s disease, chronic fatigue syndrome and Raynaud’s disease. You will need some tests like treadmill test, color Doppler, angiography, ultrasonography and MRI (magnetic resonance imaging).