The causes of congestion inside the throat may be environmental stimuli, upper respiratory tract infections, gastroesophageal reflux and so on. 1. Environmental stimulation: the mucous membrane and capillaries of the throat, by external factors such as a more polluted environment or dust and other factors, as well as spicy and irritating food, can cause congestion in the throat. 2. Upper respiratory tract infections: such as acute and chronic pharyngitis, acute tonsillitis and other diseases can also stimulate the mucous membrane of the pharynx, causing capillary dilation and congestion in the throat. 3. Gastroesophageal reflux: due to the stimulation of gastric acid, can also cause congestion of the mucous membrane inside the throat. There may be other reasons for the congestion in the throat, if the symptoms are serious, it is recommended to go to the hospital in time to identify the cause of the targeted treatment.