Can a 6 year old taking flovent and albuterol be throwing up phlegm every night from asthma?

Asthma attacks: If your child continues to cough at night and throws up phlegm, he either is not in good asthma control or is suffering from pertussis (whooping cough). I urge you to have his doctor do the pertussis test and re-evaluate his lungs. He may need oral steroids if the Flovent is not helping and antibiotics if he has been coughing for weeks. If there is enough suspicion for pertussis- azithromycin.

Poor control: The dose may be inadequate, the diagnosis incorrect, allergenic triggers may be present or the child may be having a complication of asthma such as pneumonia or an asthma exacerbation. Regardless the child should be seen by a physician within the next 24 hours.

It is possible: If the child is not under good enough control and mucous is still forming from viral illnesses, allergic related triggers also triggering asthma, them the child could still be coughing up phlegm but this is not a bad thing. Cough is good and protects your lungs so they do not collapse and gets the mucous out. Only if breathing difficulty is going on of the cough lasts more than 2 weeks, see md.