Adult symptoms. An adult with mono will experience the same symptoms that a child or teenager will experience, including fever, sore throat, swollen lymph nodes and tonsils, headaches, lack of energy and loss of appetite. They may also experience jaundice, stiffness of the neck, a rapid heart rate, and shortness of breath. Now, most adults whether they ever developed full-blown Mononucleosis or never had any known symptoms typically have protective antibodies to the Epstein-Barr virus. This is a good thing because if you have antibodies to the Epstein-Barr virus you should.
Mononucleosis is an infectious illness that’s sometimes called mono or “the kissing disease.” While you can get the virus that causes it through kissing, you can also get it in other ways like sharing drinks or utensils. It’s contagious, but you’re less likely to catch mono than other illnesses like the common cold.