What Is Mononucleosis? (Also Known As Mono or “The Kissing Disease”) Early Childhood Growth & DevelopmentFeverHerbal SupportImmune SystemRashSore ThroatStrepViral Infections What Is Mononucleosis? (Also Known As Mono or “The Kissing Disease”) Mononucleosis (most often called mono but sometimes called “the kissing disease”) is a common viral…Dr. Green MomFebruary 5, 2026