Yellow mucus or phlegm is usually a sign of active infection or rarely reflux of bile. The flank and back pain
may signify a coxsackievirus infection. Since you are experiencing chills, you should rule out malaria
, dengue, typhoid and urinary tract
infections. You may also need to have a course of antibiotics in addition to the regular supportive treatment such as rest, anti-histamines, anti inflammatory medications, cough suppressants (not expectorants!), steam and fluids. If you have any worsening of symptoms you must see a local physician and rule out influenza
. A common viral fever
will respond to the medications mentioned above.