When a person is deficient in iron, symptoms of anemia, xerostomia, brittle nails, spatulate nails, affecting growth and development, fatigue and weakness, muscle aches and pains will occur. Once the human body is seriously affected by iron deficiency, it is recommended to go to the hospital for examination and diagnosis. 1. Anemia symptoms: Iron deficiency will lead to iron deficiency anemia, hemoglobin content is reduced. Mainly manifested as pale, fatigue, dizziness, headache, tinnitus and other symptoms. 2. Keratitis: Iron deficiency can lead to keratitis, lingual inflammation, flushing of the corners of the mouth, oral ulcers, and atrophy of the tongue papillae in the oral cavity. 3. Brittle nails and spoon-shaped nails: Iron deficiency can cause fingernails and toenails to become thinner, weaker, flatter and easier to break. The main manifestation is that the nails appear sunken or spoon-shaped. 4. Impact on growth and development: Iron deficiency affects physical development, reduces the level of health and athletic ability, resulting in easy fatigue and muscle aches and pains. It is recommended that when symptoms of iron deficiency occur, you should consult a doctor for timely examination and treatment under the guidance of a doctor.