Common symptoms include:

• General fatigue
• Weakness
• Pale skin
• Shortness of breath
• Dizziness
• Strange cravings to eat items that are not 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
• Headache

If untreated, complications may include:

• Mild iron deficiency doesn't cause any complications but if it is left untreated it will lead to health problems as follows:
• Iron deficiency may lead to rapid or irregular heartbeat.
• Problems like premature births and low birth weight babies may be seen during pregnancy.
• Infants and children may become anemic and development might also be delayed.