In Southeast Asia, dengue fever (DF) is endemic. Dengue fever is caused by the flaviviridae virus, that is spread due to the bite of an mosquito which is infected, Aedes aegypti. Dengue fever can aggravated by dengue haemorrhagic fever and dengue shock syndrome. Encephalitis, meningitis, hepatitis, acalculous cholecystitis, appendicitis, pancreatitis, parotitis, myocarditis, adult respiratory distress syndrome, pleural effusion, ascites, and scrotal and penile oedema are some of the conditions that can cause it. Dengue has spread over Africa, Americas,Eastern Mediterranean, Southeast Asia,Western Pacific, with  disease being endemic in over hundred countries. Most adversely suffered regions are Southeast Asia and the Western Pacific. Dengue fever is estimated to affect fifty million people all over the world annually, by the data provided by world health organization. A significant increase in urban populations is exposing an increasing number of individuals to this vector, particularly in locations where mosquito breeding is frequent, like domestic water storage common & other waste disposal systems are insufficient. Reasons behind etiopathological consequences of dengue fever and severe dengue illness is unknown. In an endemic location, it has been observed that sequential manifestation by any 2 of the 4 serotypes of dengue virus causes DHF/DSS. Antibodies generated during the initial infection are thought to be capable of neutralizing a second viral infection of the same serotype. Symptomatic treatment is used. Because of the danger of bleeding, aspirin should be avoided. In individuals with shock, volume replacement and blood transfusions may be necessary. Mortality rates are less than 1% with intensive care support. Corticosteroids have yet to be demonstrated to be useful. This is a case report of 18 year old male with dengue hemorrhagic fever & thrombocytopenia with right sided hydrocele.