Protocol for the development of clinical guidelines for the management of chronic primary pain.

INTRODUCTION Pain is an unpleasant sensory and emotional experience associated with actual or poten-tial tissue damage.In 2018,the World Health Organization(WHO)revised the Interna-tional Classification of Diseases,11th Revi-sion(ICD-11)to include chronic pain as an independent disease for the first time(MG30.0).1 At the same time,the ICD-11 also developed new classifications for chronic pain,including chronic primary pain(CPP),chronic cancer-related pain,chronic post-surgical or post-traumatic pain,chronic secondary musculoskeletal pain,chronic secondary visceral pain,chronic neuro-pathic pain and chronic secondary head-ache or orofacial pain.