EBV is a human herpes virus that is widely distributed worldwide and is mainly transmitted through saliva. Infection occurs in young children and is often asymptomatic. Antibodies can be measured in 90% of adults. When primary infection occurs, it can cause infectious mononucleosis. EBV infection is also strongly associated with the development of nasopharyngeal cancer and lymphoma in African children. Its incubation period is 4-7 weeks. The infection can affect all systems of the body, and the clinical manifestations are complex and varied. Fever, loss of appetite, nausea, vomiting, diarrhea, generalized lymph node enlargement, hepatosplenomegaly, and skin rash are common. In some cases, neurological symptoms may also appear. The recovery period for this disease is long, usually taking 2-4 weeks. Infectious mononucleosis is one of the clinical types of primary EBV infection. Nearly half of them have prodromal symptoms such as general malaise, headache, dizziness, chills, nasal congestion, nausea, vomiting, loss of appetite, and loose stools. The duration of the disease varies from a few days to 6 months, but most are 1-3 weeks. Occasionally, relapses occur, and when they do, the duration of the disease is shorter and less severe. In a few cases, the disease can extend over months or even years, and is called chronic active EBV infection. The main manifestations of infectious mononucleosis are fever, enlarged lymph nodes, pharyngitis, rash, enlarged liver and spleen, and conjunctival congestion, cyanosis, and rhinorrhea. These are the main clinical manifestations of infectious mononucleosis caused by EBV infection. If you have any other discomfort, you should also seek medical attention to diagnose whether you have other diseases.