Antiphospholipid syndrome (APS) and systemic lupus erythematosus (SLE) are frequently discussed together and considered two closely related diseases.APS involves multiple organ systems,but APS-related endocrine manifestations are rare.[1]Among them,adrenal insufficiency (AI) is the first endocrine manifestation of APS.The prompt diagnosis of AI is critical,as this disorder has high morbidity and mortality if left untreated.Here,we report a rare case of acute AI caused by APS secondary to SLE.CASEIn August 2022,a 39-year-old woman without a significant family history of medical diseases presented to our emergency department (ED) for low back pain,nausea,anorexia,fatigue,hypoglycemia,and hypotension.One month prior,she had fatigue,loss of appetite,low back pain,cough with sputum,