Fatigue or low energy
Pale skin
Shortness of breath
Dizziness or lightheadedness
Headaches
Cold hands and feet
Rapid heartbeat
Weakness
Brittle nails
Hair loss
Cravings for non-food items like ice or dirt
Sore or swollen tongue
Cracks at the corners of the mouth
Trouble concentrating
Restless legs
Frequent infections
Blood test showing low hemoglobin or ferritin