Still’s disease, also known as systemic juvenile idiopathic arthritis, is an autoimmune disorder with a triad of fever, salmon pink rash, and inflammatory polyarthritis. Its diagnosis is quite challenging due to the lack of specific symptoms and overlap with many other rheumatological and autoimmune disorders. However, recent studies have shown that high serum ferritin levels can act as a biomarker for this disease. Ferritin is an intracellular iron storage protein that acts as a pro-inflammatory reactant. There are various explanations indicating the presence of higher ferritin levels in Still's disease. High ferritin tells us about disease severity, and prognosis and can also predict life-threatening complications that can be easily prevented and thus it helps in reducing mortality associated with Still's disease. However, there are certain limitations to the use of ferritin as the only diagnostic marker for Still's disease. Overcoming those limitations can take the diagnosis of Still's disease to a higher level.