Dark drown and thick phlegm only occasionally in the morning, also experience dry mouth in the morning but feel fine throughout the day. any concerns?

Dr. can check throat: New throat symptoms can be from a strep throat infection (antibiotics are needed), a cold or influenza (antibiotics usually not used), or from some other cause such as allergies, irritants, or stomach acid reflux. Usually, a person sees the doctor if the sore throat is bothersome, recurrent, or doesn't go away quickly. If "dry mouth" persists, the doctor can check for other disorders.