Fatigue or unusual tiredness
Weakness
Pale skin or pale inner eyelids
Shortness of breath
Dizziness or lightheadedness
Headaches
Cold hands and feet
Rapid or irregular heartbeat
Chest pain
Trouble concentrating
Brittle nails
Craving ice, dirt, or starch
Sore or smooth tongue
Restless legs
Frequent infections
Low hemoglobin or hematocrit on a blood test
Low red blood cell count on a blood test