It is a type of viral infection which causes swollen lymph glands, fever and sore throat, especially in the neck. The disease is also called as mono or the kissing disease. This named so coined is due to the nature of the disease. It spreads through kissing i.e. saliva or by sharing glass, food utensil and through cough or sneezing. In case of young adults, the disease can be seen quite often. Carelessness may lead to enlarged spleen. Common symptoms may begin slowly with fatigue, a general ill feeling, headache, and sore throat. Resting and intake of adequate amount of fluid is the ultimate cure.