Fatigue or low energy
Weakness
Pale skin
Shortness of breath
Dizziness or lightheadedness
Headaches
Cold hands or feet
Fast or irregular heartbeat
Brittle nails
Hair loss
Craving ice, dirt, or starch
Sore or swollen tongue
Restless legs
Trouble concentrating
Blood tests showing low hemoglobin, ferritin, or iron levels