Hi, Thanks for writing in. There are occasions when the chemotherapy and radiation therapy treatments might cause certain side effects involving the autonomic and sensory nervous systems due to mild effects. This is seen as breaking out sweat and body tingling. It will also be important to know if he has any risk t developing a stroke like episode or there is nutritional deficiency of vitamins. Please have his condition evaluated if the symptoms happen again. Provide him a daily 2200 kcal diet including vitamins and minerals. Please do not worry.