Fatigue or unusual tiredness
Weakness
Pale skin
Shortness of breath
Dizziness or lightheadedness
Headaches
Cold hands and feet
Rapid heartbeat
Brittle nails
Hair loss
Cravings for ice, dirt, or starch
Sore or smooth tongue
Cracks at the corners of the mouth
Trouble concentrating
Restless legs
Confirmed low hemoglobin or ferritin on blood tests