BACKGROUND The adult Still's disease is a systematic disease rarely reported in the black Africans. We are reporting a case characterized among other difficulties by its diagnostic difficulties. METHODS It is about a 29 years old black Senegalese woman patient, without particular antecedents, which presented a systematic chronic syndrome composed of a pharyngitis, a polyarthritis and general symptoms (fever, chills, sweats, change of the general state), a cutaneous eruption, a polyadenopathy, a hepatosplenomegaly. The biological analyses showed among others, an inflammatory syndrome (VS at 115 mm in the 1st hour, CRP at 100 mg/L, WBC at 10,400/mm3 with neutrophilia), a hyperferritinemia in 643 ng/l with collapse of the glycosylated ferritin at 13% (N between 60 in 80%). After elimination of any autoimmune or neoplastic suppurative infectious pathology in the decline of a check up as exhaustive as possible, the diagnosis of a Still disease in adult had been retained. Their was improvement under the combination of prednisone and methotrexate. CONCLUSIONS Although it is exceptional in black African, this pathology shall be however part of the differential diagnoses of any unexplained systematic sign. The dosage of the ferritinemia and its glycosylated fraction as well as the resort to the criteria of Yamaguchi and Fautrel's classification of Still Disease in Adult shall allow to establish more prematurely the diagnosis of this potentially severe affection.