Mononucleosis, also often referred to as simply mono, is a common viral infection that is usually associated with young adults and teens. Mono is sometimes called the “kissing disease” because it is commonly spread via saliva, so it can spread via kissing or sharing kitchen utensils. Mono causes many symptoms, with the most well-known being extreme fatigue. Coughing is usually not associated with mono and is more common with upper respiratory illnesses like a common ...