Pain at the back of the palate connected to the nasal cavity when swallowing saliva mostly refers to nasopharyngitis, and the main causes include infection, peripheral inflammation dissemination, immune system diseases, and tumors. 1. Nasopharyngitis: mainly associated with bacterial and viral infections, such as upper respiratory tract infections leading to local mucosal congestion, redness and swelling, which can cause related symptoms. 2. Peripheral inflammation spread: rhinitis, sinusitis secretion backflow to the nasopharynx can stimulate the nasopharyngeal mucosal inflammatory reaction, which will cause related symptoms. 3. Immune system diseases: immune system diseases that affect glandular secretion, such as dry syndrome, can also cause local pain and discomfort. 4. Tumor: malignant tumors in the pharyngeal cavity can cause damage to the surrounding tissues, resulting in local mucosal ulceration, which can also cause related symptoms. If the pain in the corresponding part is not recovered, it is recommended to consult a doctor for a clear diagnosis and carry out standardized treatment under the guidance of a specialist.