Numbness in fingers and toes can signal damaged nerve fibers

High blood sugar can cause diabetic neuropathy, a condition where nerve fibers are damaged due to impaired blood flow and nutrient delivery. Because early symptoms are often subtle, the disease may progress for years before being detected. Chronic hyperglycemia damages small blood vessels and nerve endings, leading to a loss of sensation in the extremities. Warning signs of diabetic neuropathy Peripheral nerve damage typically begins in the hands and feet, gradually spreading toward the wrists and ankles—a pattern physicians describe as the "gloves and stockings" effect. Changes in how the body perceives external stimuli or movement are primary indicators of the condition. According to endocrinologist Ekaterina Orlova, numbness or tingling in the fingers is a signal that nerve fibers are lacking proper nutrition. She notes that when these symptoms are accompanied by joint or hand weakness, making it difficult to hold objects, a blood sugar test is necessary.