My mother 63y is suffering 4A degree toncil cancer and undergone 36 IMRT radiation which was completed on 25 july 2012. two out of six chemo only could complete due to her blood count went very low. Her peg tube was removed very imediately after treatment due to infection. so she can drink liquid food only. There is heavy pain from the burnt area of toncil.Edoscopy results are showing very positive. Even after 3 months her pain is not getting cure and unable to take solid or ****y foods. Could you expain me the reason for this prolonged pain and what approach shall I take to recover this? How long does the pain last?