The symptoms of moderate to severe iron deficiency anemia include:

• general fatigue
• weakness
• pale skin
• shortness of breath
• dizziness
• strange cravings to eat items that aren't food, such as dirt, ice, or clay
• a tingling or crawling feeling in the legs
• tongue swelling or soreness
• cold hands and feet
• fast or irregular heartbeat
• brittle nails
• headaches