Dengue virus infection usually causes a fever with intense joint pain and sometimes rash. This has been described as "break bone fever" because you feel as though your joints are going to come apart. Symptoms last for about two weeks. Then you recover and feel better. Rarely, dengue fever can become more serious and even deadly. In these cases, the host not only develops fever-like symptoms, but also hemorrhagic lesions throughout his or her body, which if untreated can cause severe bleeding, shock, and eventually death. This severe form of the disease is more likely to develop if the person has been infected with dengue before. There are four serotypes, or variations within one species, of dengue, so theoretically a person may be infected up to four times.