Plastic surgery has acquired an important place in primary breast cancer treatment (conservative or radical) and in the treatment of sequelae. The authors have tried to define, based on their experience, the contraindications for breast reconstruction. They are rare from a technical point of view. The carcinologic contraindications are relative: highly aggressive cancers, locally advanced cancers, cancers with metastases or recurrences. Radionecrosis and radio-induced sarcomas, treatment sequelae are also contraindications for breast reconstruction. General contraindications are relative (major obesity, smoking, diabetes, general weakness). Psychological contraindications must be taken into consideration. The authors conclude that contraindications for breast reconstruction are mainly carcinologic and the decision for reconstruction is usually taken by the patient after complete medical information.