A constant feeling of phlegm in mouth or
throat and persisting cough at times
can be due to gastric reflux. Either
you have a lax esophageal sphincter or hiatal hernia or severe acidity. Take a late night snack. Raise head end of bed. Take Omeprazole empty stomach in morning and an antacid gel at bedtime. Refrain from smoking, alcohol, fuzzy drinks, caffeine, and spicy food. See if these tips help. If they do not help consult your doctor.
Take care!