What are signs that you might have a vitamin deficiency?

Common signs of vitamin deficiency include persistent fatigue, weakness, and brain fog, which often point to low B12 or iron. Pale or yellowish skin can indicate B12 or folate deficiency, while bleeding gums and slow wound healing suggest low vitamin C. Bone pain and muscle weakness are classic signs of vitamin D deficiency. Hair loss, brittle nails, and dry skin may signal deficiencies in biotin, zinc, or vitamin A. Night blindness or difficulty seeing in low light points to vitamin A deficiency. Numbness or tingling in hands and feet can indicate B12 or B6 issues. If you notice several of these symptoms together, a blood test from your doctor can confirm specific deficiencies.