Your Symptoms Browse: A B C D E F G H I J K L M N O P Q R S T U V W Y Obesity - body mass index Obtundation Odynophagia Oliguria Onycholysis Open comedones Ophthalmalgia Opisthotonos Orchalgia Orchitis Orthopnea Otalgia Otitis media - tinnitus Otorrhea Overactive bladder (OAB) syndrome Overbreathing Overeating - compulsive Overweight Overweight - body mass index