Muscular pains. Mononucleosis causes severe pains in the muscular tissues. When combined with exhaustion and fever, this can be considered an important symptom of the disease. Ibuprofen is generally prescribed to assist with this issue, as is a heightened fluid intake… and plenty of rest.
Breathlessness. Mononucleosis seems to put a considerable amount of stress on the system, and you may find that your breathing is heightened, that is to say, you are breathing at faster than your normal rate, or else that you are feeling breathless. This is because the infection is placing considerable amounts of stress on the body, and also because the tonsils are enlarged, constricting the air passageways. If you experience any of these symptoms, you should consult your health specialist and check if they are caused by mononucleosis. As your body heals from the infection, these symptoms – including the breathlessness – will pass.