过敏性紫癜(Henoch-Schönlein purpura, HSP)又称为IgA血管炎,是由IgA免疫复合物沉积介导的全身性小血管炎。HSP以儿童最常见,成人较为少见。临床上以皮肤紫癜最多见,可伴有关节、胃肠道及肾脏等各系统症状。当腹部症状先于紫癜出现时,易被缺乏相关经验的临床医生误诊为急腹症、急性阑尾炎、消化道出血等疾病。现报道1例以腹部症状为主的成人混合型HSP,目的在于提高临床医生对HSP的诊治水平,避免延误患者的诊治。Henoch-Schönlein purpura (HSP), also known as IgA vasculitis, is a systemic small vasculitis mediated by IgA immune complex deposition. HSP is most common in children and less common in adults. The most common clinical skin purpura, can be accompanied by joint, gastrointestinal and kidney and other system symptoms. When the abdominal symptoms appear before purpura, it is easy to be misdiagnosed as acute abdomen, acute appendicitis, gastrointestinal bleeding and other diseases by clinicians who lack relevant experience. A case of adult mixed HSP with abdominal symptoms was reported in order to improve the diagnosis and treatment of HSP by clinicians and avoid delay in diagnosis and treatment.