Get checked. : Coughing up phlegm for sometimes may be an ongoing allergies issues or viral infection. Upset stomach and other factors may be part of that illness but it should not be ongoing. It is good to have some blood test to see how is your immune system and how bad is the infection. Increase water intake and take some vitamins. And it is important to see your doctor.
Answered 5/21/2015
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3 doctors weighed in across 2 answers
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