The rhizome of turmeric is widely used in indigenous medicine. [1] A paste made from powdered rhizome of Curcuma longa Linn., mixed with slaked lime applied locally, is an ancient household remedy for sprains, muscular pain and inflamed joints. It is also applied in poultices to relieve pain and inflammation. [2] The volatile oil and curcumin obtained from C. longa exhibit potent antiinflammatory effect. [3] Curcumin is yellow coloured phenolic pigment, [4] obtained from powdered rhizome of C. longa Linn. (Family-Zingiberaceae). It is the major constituent of the oleoresin of turmeric. In the crude extract of rhizomes of C. longa about 70-76% curcumin is present along with about 16% demethoxycurcumin and 8% bisdemethoxycurcumin. It is extensively used for imparting colour and flavour to the food and in the traditional Indian medicine, turmeric powder is used to treat a wide variety of diseases. Extensive scientific research on curcumin have demonstrated a wide spectrum of therapeutic effects such as antiinflammatory, [5] antibacterial, [6] antiviral, [7] antifungal, [8] antitumor, [9] antispasmodic [10] and hepatoprotective. [11] Recently, its potential utility in autoimmune deficiency syndrome (AIDS) has been demonstrated. [12]-[14] In this review, the findings on curcumin's antiinflammatory activity and its mechanisms are presented. Preclinical studies Curcumin and antiinflammatory activity Arora et al reported antiinflammatory activity in different fractions of the petroleum ether extract of C. longa. [5] The total