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ABSTRACT Objectives: to validate the content of a guidance guide on self-care in the postoperative period of breast surgery for breast cancer. Methods: a methodological study with content validity, carried out with 15 expert nurses and physiotherapists, between May and July 2022. Recruitment took place from the Lattes Platform, using snowball sampling. The level of relevance and representativeness for each item was verified using the Content Validity Index (CVI). It was considered valid when CVI was equal to or greater than 78% (0.78). Results: from the initial total of 37 items, two were excluded, as they had insufficient practical relevance and theoretical relevance, and another five items which, although presenting a CVI lower than the established cut-off, were suggested to be rewritten and grouped with other similar items. Conclusions: thirty items were considered valid and demonstrated important and significant characteristics, constituting suitable material for application in clinical practice.