Symptoms of Infectious Mononucleosis (Mono): Complete Clinical List
Infectious Mononucleosis (Mono) symptoms include fever, sore throat, fatigue, swollen lymph nodes and 2 more. Learn which are most common, how they progress over time, and which warning signs require prompt evaluation.
Updated March 27, 2026
The main symptoms of Infectious Mononucleosis (Mono) include fever, sore throat, fatigue, swollen lymph nodes and 2 more. Infectious mononucleosis, caused by Epstein-Barr virus, presents with severe fatigue, sore throat, swollen lymph nodes, and splenomegaly. It primarily affects adolescents and young adults; strenuous activity must be avoided due to spleen rupture risk.
Clinical Context
Symptoms of Infectious Mononucleosis (Mono) vary between individuals and may change over the course of the condition. Early recognition allows for timely diagnosis and treatment.
Clinical Pathway
Infectious Mononucleosis (Mono) — Full Condition GuideCondition HubInfectious Mononucleosis (Mono) — Differential DiagnosisDifferentialLeukemia vs. Infectious Mononucleosis (Mono) — Comparisonvs.Fever — Symptom HubSymptomSore throat — Symptom HubSymptomFatigue — Symptom HubSymptomSwollen lymph nodes — Symptom HubSymptomHeadache — Symptom HubSymptomFrequently Asked Questions
Symptoms of Infectious Mononucleosis (Mono): Complete Clinical List?+
The main symptoms of Infectious Mononucleosis (Mono) include fever, sore throat, fatigue, swollen lymph nodes and 2 more. Infectious mononucleosis, caused by Epstein-Barr virus, presents with severe fatigue, sore throat, swollen lymph nodes, and splenomegaly. It primarily affects adolescents and young adults; strenuous activity must be avoided due to spleen rupture risk.
What are the first symptoms of Infectious Mononucleosis (Mono)?+
Early symptoms often include fever and sore throat. These can be subtle at first.
How many symptoms of Infectious Mononucleosis (Mono) are needed for diagnosis?+
Diagnosis is based on clinical criteria and does not require all symptoms. Your doctor considers full medical history and test results.
Can Infectious Mononucleosis (Mono) be present without obvious symptoms?+
Yes — some presentations can be asymptomatic or mild, especially in early stages.
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