Cancer!

Karen: Doctor, I've not been feeling well lately

Doctor: Well, I've looked at your lab reports and I'm afraid I have some bad news...

Karen: Don't give me this lab nonsense, you bureaucratic paper pusher! I don't believe Western medicine anyways! I've been following homeopathic medicine, faith-based approaches, and healing crystals all my life, and they never let me down. Now, will you do things my way, or do I need to talk to the hospital management?

Doctor: Sure, sure, lady. We'll do things your way. Does an astrology-based approach work for you?

Karen: That's better! Of course, it would!

Doctor: What's your birth sign?

Karen: Cancer.

Doctor: Well what a fucking coincidence.

PS: it's my Cake day, I am Cancer (July), I am a doctor, I hate quacks! It fits.