Silent Signals: Are You Tired, or Is It Iron Deficiency?

Physical Appearance and Skin Changes
The red color of blood is due to the presence of hemoglobin; therefore, low iron levels cause the blood to appear less red. This results in the skin, especially in areas like the face, the inside of the lower eyelids, or the nails, appearing pale or yellowish. This is one of the first signs doctors look for during a clinical examination.