Anemia — a decrease in red blood cells and in hemoglobin, an iron-rich protein in red blood cells Thrombocytopenia — low count of platelets, which are blood cells involved in clotting Heart problems — an inflammation of the heart muscle (myocarditis) Complications involving the nervous system — meningitis, encephalitis and Guillain-Barre, syndrome swollen tonsils — which can block breathing. Mono can cause the spleen to swell. Severe pain in the upper left part of your belly may mean that your spleen has burst. Signs and symptoms to watch for mononucleosis (MONO) infection: · Fatigue, Sore throat, strep throat that doesn't get better with antibiotic use Fever Swollen lymph nodes in your neck and armpits Swollen tonsils, Headache, Skin rash and Soft, swollen sple.
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