The study aim is to know indigenous people perception, diagnosis and etiology about black fever. The perception of black fever differs to them. To them, black fever means curse of God, black power and black magic. 70% patients know about black fever through NGO or medical test. Indigenous Santal people said about different physical characteristics of black fever. Those are angry, cold felling and avoiding rice, headache, lack of blood, birth of dead children, belly become big and stop menstruation, loss of weight and strength etc. People’s knowledge about black fever, long time to recognize black fever, belief in supernatural power, belief it is touchable and fear about stigma effect on treatment of black fever patient. 78% patients believe their poor knowledge regarding black fever affect treatment process. After taking treatment from NGO or medical center 45% people didn’t face any side effect and rest of them face side effect.