Why does the edge of one side of the tongue hurt?

The main causes of pain on one side of the tongue edge include oral inflammation, gingivitis, oral infections, periodontal disease, dental problems, periodontitis, or oral cancer. In addition, pain on one side of the tongue edge may also be caused by allergies, smoking, alcohol, hot foods, acidic foods, excessive sugar intake, oral corrosion, or oral trauma. Patients should undergo regular oral examinations to detect oral diseases early and seek timely medical treatment.