Inclusion Criteria:  Female patients 18-75 years of age Undergoing breast cancer surgery (wide local excision with magseed or full mastectomy) Pain Catastrophizing Scale score of 24 of higher  Exclusion Criteria:  Pain Catastrophizing Scale score below 24 Surgery for benign breast disease Patient non-consent Plans to undergo major surgery within six months after current breast surgery Comorbid severe psychiatric conditions such as schizophrenia or personality disorder Known or suspected non-compliance Known or suspected drug or alcohol abuse problems within past 3 months Inability to follow the study procedures e.g. dementia or non-fluency of English The presence of any serious medical comorbidity such as sepsis or cancer that might cause disability or worsen the patient's general health condition Pregnancy An opioid intrathecal pump Prisoner within the criminal justice system Cognitive behavioural therapy in the past 12 months