Systemic diseases may manifest in the oral cavity. This chapter reviews the oral mucosal pathology in blood diseases, gastrohepatic diseases, kidney diseases, immunologic and connective tissue diseases, endocrine diseases, pulmonary diseases, nutritional deficiencies, dermatologic diseases, as well as cancer-associated oral mucosal conditions. The oral mucosa is one of the most commonly affected tissues and may present with unique clinical appearances. Oral mucosal involvement may be the first presentation of the systemic disease or reflect activity or progression of the primary condition. Therefore, it is of importance to be familiar with oral mucosal manifestations of these systemic diseases.
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