Up to 60% of women who are treated surgically for breast cancer, will experience chronic pain as a consequence of the treatment. This condition was previously referred to as "Post Mastectomy Pain Syndrome", but because the condition is also seen after less extensive forms of breast cancer surgery, the condition is now termed "Post Therapy Breast Pain Syndrome" (PBTPS). PBTPS is defined as a neuropathic pain condition with pain localized to the axilla, the medial part of the upper arm, chest and or chest wall of the side of surgery, lasting more than three months after surgery and / or the end of treatment.