Sore throat can occur due to several causes. The common causes are infectious mononucleosis, streptococcal throat infection
, tonsillitis, chronic sinusitis etc. Infections and viruses, gingivitis, malnutrition, dry mouth, dentures, certain toothpastes, alcohol use can lead to swelling of the gum. Maintain oral hygiene. A proper nutrition and diet is equally important. Take a diet rich in vitamin C and B it will help in your sore throat and swollen gums both.