Introduction: Adult Still’s disease (ASD) is an uncommon inflammatory disorder characterized by fevers, a salmon-colored rash, and arthritis. Cytokines storm syndrome related to Coronavirus-19 (COVID-19) usually occur in acute period of COVID-19 and can mimic clinical features of ASD. Case report: We present a case of a 27-year-old male who was hospitalized in July 2020 due to fever, sore throat, multiple joint pain, and body rash for 2 weeks. Patient recovered from COVID-19 8 weeks ago but his nasopharyngeal SARS CoV-2 PCR was still positive on current hospitalization. Post COVID-19 cytokines storm syndrome post COVID-19 was suspected but after further assessment and investigations, diagnosis of ASD was established and patient was treated with corticosteroids therapy and had favorable outcome. Conclusion: During COVID-19 pandemic, diagnosis of many other diseases either were delayed or missed. We encourage all clinicians to have a broader differential diagnosis to improve patient care and outcome.