How Do You Know You’re Low in Iron? Dr. Janine shares signs and symptoms you’re low in iron. She talks about how hair fall and dry cracked lips, especially at the corners of the mouth, are signs of low iron levels. She explains that headaches are a common symptom of low iron. She looks at how fatigue and lack of concentration are also signs of iron deficiency. Lastly, Dr. Janine offers tips to increase your iron levels. She suggests eating foods high in iron and taking a whole-food iron complex