Every morning there is a mouthful of yellow sputum symptoms are considered to be pharyngitis, because the pharynx is infected by germs or external stimuli, the surface mucous membrane layer of tissue will appear to have capillary congestive hypertrophy as well as mucous membrane glandular hyperfunction, these factors will lead to pharyngeal redness, swelling, pain, secretion of fluid increased situation. After waking up in the morning, the human pharynx phlegm stock is more, the body through the reflex activity of the phlegm out of the body, phlegm carries pathogenic bacteria and pharyngeal necrotic tissue, so there will be a yellow sputum. However, bronchitis, tonsillitis and other types of diseases can lead to the appearance of yellow sputum symptoms, because the respiratory tract tissues are affected by the disease will lead to pathological changes in the mucous membrane of the tracheal tract and caused by the increase in mucus, so the specific cause of the disease need to go to the hospital for an in-person examination to be able to confirm the diagnosis.