This is otherwise known as “mono” or “the kissing disease”. Mono is cause by the Epstein Barr virus (EBV). It effects teens and young adults, and young kids in third world countries. The way mono is transmitted to the body is by person to person by saliva. Ways you could do this would be kissing, sharing drinks, silverware or toothbrushes. The symptoms or mononucleosis are fatigue, headache, sore throat, abdominal pain and nausea. The tonsils in someone’s body afflicted with mono may swell due to the sore throat. Bad cases of mono may cause enlarged li