Dysphagia for more than a year, through this symptom can not determine whether the malignant changes. Dysphagia often occurs in chronic pharyngolaryngitis, esophagitis, esophageal function abnormality, etc. It may also be caused by esophageal and pharyngeal tumors. 1. Chronic pharyngitis: chronic pharyngitis, foreign body sensation in the pharynx and dysphagia can occur. 2. Esophagitis: mostly seen in reflux esophagitis, mainly due to the reflux of gastric contents into the esophagus, causing local irritation and esophageal mucosal damage and erosion, which will lead to dysphagia. 3. Abnormal esophageal function: the esophagus transports food to the stomach mainly by the peristaltic movement of smooth muscle, which may lead to dysphagia when the function of smooth muscle lactation is weakened. 4. Tumors: for example, pharyngeal tumors, esophageal cancer, esophageal smooth muscle tumor, etc., often lead to progressive dysphagia. If you have dysphagia for more than a year, you should go to the hospital in time to find out the cause and cooperate with the doctor to take treatment.