Slight thickening of the left epiglottic fold may be related to inflammation, cysts and tumor disease. 1. Inflammation: e.g. epiglottitis, which can lead to thickening of the left epiglottic fold, accompanied by symptoms such as sore throat, dyspnea and dysphagia. 2. Cysts: cystic lesions can be formed after the mucus glands in the left crease of the epiglottis are blocked. In the early stage of the disease, patients often have no conscious symptoms, and the left crease of the epiglottis is only slightly thickened. 3. Tumor disease: the left crease of epiglottis has tumor-like lesions, and the thickening of the crease can also occur. If there is no timely intervention, pain and dyspnea may occur as the tumor grows and spreads. When this phenomenon occurs, it is recommended to consult the doctor for a clear diagnosis and follow the doctor’s instructions for treatment.