What are the symptoms of syphilis?

Syphilis can progress through several stages, each with its own symptoms. The primary stage is marked by the appearance of a sore or chancre at the site of infection, while the secondary stage can cause a rash, fever, and swollen lymph nodes. If left untreated, syphilis can progress to the latent and tertiary stages, which can cause serious health problems like blindness, paralysis, and dementia.