Assistant Professor, Department of Emergency Medicine, Mount Sinai School of Medicine; Francisco Talavera, PharmD, PhD, Senior Pharmacy Editor, eMedicine; Ron Fuerst, MD, Clinical Assistant Professor, Department of Pediatrics, University of South Carolina College of Medicine; Director, Children's Emergency Center, Children's Hospital of Richland Memorial Hospital.Types Of Hair Loss - Why Hair Loss Has Different PatternsWhy Is Provillus Hair Loss Treatment So Popular?Reasons Why Hair Loss Happens And What We Can Do About It