What primary symptom is associated with Mononucleosis?

Mononucleosis, often caused by the Epstein-Barr virus, presents a variety of symptoms, with fever being one of the most prominent. This condition typically leads to an elevated body temperature due to the body's immune response fighting the viral infection. The fever is often accompanied by other symptoms such as sore throat, swollen lymph nodes, and fatigue, which together can help distinguish mononucleosis from other illnesses.

While joint pain, coughing, and nausea can occur in numerous other illnesses, they are not defining symptoms of mononucleosis. The presence of a fever is much more characteristic of this condition, signaling the active infection and inflammatory response. Thus, identifying fever as the primary symptom is crucial for understanding and diagnosing mononucleosis effectively.