** Thanks for contacting with your health concern 1. with symptoms of green phlegm, cough for more than 2 months now. it probably could be a bacterial infection, seasonal allergy or bronchitis, thus following should be your approach: i. check with a Chest specialist [pulmonologist] for necessary examination and investigations like . Hb%, WBC for eosinophilia . X-ray chest for TB, Pneumonia . If other investigations are normal, HIV test [as routine] ii. The choice of antibiotic will vary from doctor to doctor, and from locality to locality, till then - maintain good oral hygiene, rinse your mouth after every meal, avoid smoking, tobacco chewing. - Take mainly soft diet - rice, chapati, or phulka, with nonspicy vegetables. - Avoid fried foods like wada, samosa, dosa, pakodas, papad,namkeen and potato chips, avoid hotel food. . Do not take any cold drinks, cold water, ice cream, chilled food from the refrigerator. . Avoid sour fruits like citrus fruits, grapes, take sweet fruits- bananas, papaya . Steam Inhalation and warm salt water gargles. . Cover the mouth while coughing (using hand or handkerchief) to prevent the spread of infection to other family members. PS. Consult an ENT specialist [for quick visual examination of the throat] and for any necessary investigation(s)