Syphilis
In the primary stage, a person usually just has a wound on their skin, called a "chancre." In the secondary stage, a person usually gets a rash. In the "latent" stage, syphilis has few or no symptoms. If syphilis reaches the tertiary stage, which is the most severe, it causes many serious symptoms. These can include problems with the nervous system (the brain and nerves) and problems with the heart. Eventually, many people with tertiary syphilis will die if they do not get medical treatment.