Home > ADHD Glossary of Terms > Exogen StageHairExogen StageThe exogen stage of hair loss is when hairs fall out as new ones grow. This happens when the anagen phase starts over. About 100 to 150 hairs normally fall out each day, but the exact number can differ for each person.Related termsAlopecia AreataAlopecia TotalisAlopecia UniversalisAnagen EffluviumAnagen PhaseAndrogenetic Alopecia← Back to full glossary