No, you should not be worried. It is fine.
Does the friend has the history of stealing. If he does then you should be worried, but if he does not you should not be worried. But to be safe, you can keep you stuff on safe place to avoid excuses.
HPV and syphilis are different infections. Patients with genital warts should be screened for syphilis, though, since second-stage syphilis can also causes wart-like lesions.
Yes, you should be worried if it was not caused by mosquitoes or falliing.
should i be worried about this bump at the corner of my right ears?
My friend, the whole world should be worried about Global Warming, including you.
Depends if you want to be pregnant. If not you should be worried...
you should be some what worried because that could mean that you are not socializing him properly.
You should never be 'worried' about girls. They are not dangerous, unless you lack self-control.
The most dangerous type of radiation is Nuclear radiation which is the one that should be most worried about.
Because it's an STD....It's like saying "Hey I want cancer forever!" Syphilis, if untreated, can actually have some rather serious consequences. It can impact the heart/cardiovascular system and even progress to neurosyphilis (tertiary syphilis). Also, syphilis is a highly transmittable STD, so anyone with syphilis should get it treated right away so that they're healthy and don't spread it to other people.
Yes you should be worried. You should get the microwave tested for radiation leakage before you use it again.