Tiredness and headache are such common symptoms that they rarely indicate a mono outbreak.
Mono outbreaks are also rare (in 6% of infected people). You canât find out if you are infected with mono before you feel the symptoms. You may want to consult your primary health provider if you get a fever, swollen lymph nodes, sore throat, muscle weakness, etc. Even if you get infected there is nothing to be worry about because mono is an easy disease. It usually passes spontaneously.