Cold hands or tingling sensation in hands indicates poor blood circulation. Diabetes, obesity, heart diseases, frostbite, under-active thyroid, pinched nerve, sitting or sleeping in an awkward position that compresses the arm veins and blood vessels, nutritional deficiencies, tumors along the nerves, occurrence of diseases like multiple sclerosis, Raynaud's syndrome, kidney problem, lung disease, etc., can lead to poor blood circulation.