The thought of getting cholecystitis scares me. What are risk factors for it?

Gallstones. Cholecystitis may be chronic, causing repeat episodes of upper abdominal pain lasting "hours", or acute, causing constant pain which may require urgent surgery to treat. With rare exception, these diseases are due to gallstones, which can be easily diagnosed by a simple ultrasound. This may also be easily treated through out-patient minimally invasive (laparoscopic) surgery.
Common. Risk factors for developing cholecysitis are the same as those for developing gallstones; being overweight, or loosing a lot of weight in a relatively short period of time; having kids; being older; and being female.