It will eventually kill you, but it is a bacterial infection-so it can be easily treated with antibiotics.
You get syphilis from unprotected sex. Still if you have a condom or something like that DO NOT have sex with that person who has syphilis.
Syphilis is an STD [sexually transmitted disease] and a very dangerous one. unless treated it will kill after it has rotted your brain.
You catch syphilis by having sex with an infected partner.
Syphilis is a STD and is contracted by having sex with an infected partner.