2. You have anemia
Anemia is a condition where the body produces too few healthy red blood cells. It’s most commonly caused by an iron deficiency. Since the hair needs so many vitamins and nutrients to keep it healthy, an iron deficiency could cause slowed growth, leading to thinning hair. Talk to your doctor about measuring your iron levels. Most of the time, hair loss from iron deficiency is temporary.
Next: Are you regularly taking any of these medications?