Fatigue or low energy
Pale skin
Shortness of breath, especially with activity
Dizziness or lightheadedness
Headaches
Cold hands and feet
Rapid heartbeat or palpitations
Weakness
Brittle nails
Hair loss or thinning hair
Cracks at the corners of the mouth
Sore or swollen tongue
Restless legs
Craving non-food items like ice, dirt, or starch
Difficulty concentrating
Irritability
Frequent infections
Blood tests showing low hemoglobin, low ferritin, or low iron levels