 The purpose of the SYNK study is a randomized design to test the effect of theory based intervention on eating dysfunctions secondary to radiation treatment for HNC. The SYNK intervention consists of: i individual instructions in swallowing and mouth opening exercises 3 days per week by occupational therapist throughout radiotherapy, ii progressive resistance training twice weekly by physiotherapist, either individually or group based, throughout radiotherapy, iii daily home-based swallowing and mouth opening exercises from beginning of treatment until 2 months after end-of-treatment self-practice, and iv weekly follow-up phone contacts with occupational therapists from end-of-treatment and 2 months onwards. 