About health, I found two "acceptable" jokes in Internet (see: Aha! jokes) What difficult it is to laugh in another language!
* Bad temper problem
- Patient: Doctor, you must help me. I'm under such a lot of stress, I keep losing my temper with people.
- Doctor: Tell me about your problem.
- Patient: I just did, didn't I, you stupid fool!!
Thinking of the stressed people that we see every day running towards the work, this does'nt seem a so fictitious situation to me.
* Preventive medicine belief
- Mary: My daughter believes in preventative medicine, doctor.
- Doctor: Oh, really?
- Mary: Yes, she tries to prevent me from making her take it!
And my pun is...
"Seven days without a pun makes one weak" :-D
(you can see: http://www.punoftheday.com)