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You havent mentioned your age, sex, medical conditions , and presence of fever
or any other symptoms.
Green colored phlegm indicated presense of bacterial infection. So see a doctor and take the required medicines and also undergo investigations like a chest x-ray and a blood count, to rule out other possibilities.
A chronic cough
like yours can cause pain & palpatation. Even a cardiac illness like pericarditis
. So please see a doctor personally.
1. Drink warm water 3-4 glasses/day.
2. Avoid Cold
3. Avoid over exertion.