Coma: A state of deep, unarousable unconsciousness. A coma may occur as a result of head trauma, disease, poisoning, or numerous other causes. Coma states are sometimes graded based on the absence or presence of reflexive responses to stimuli. QUESTION The abbreviated term ADHD denotes the condition commonly known as: See Answer From Brain and Nervous System Resources B-Cell Therapy for Multiple SclerosisFighting MS Fatigue With Physical Activity Brain Tumors in Adults Featured Centers Good and Bad Foods for PsoriasisVideo: Getting Personal on Life With MS Health Solutions From Our Sponsors Shot-Free MS Treatment Your Child and COVID-19