Cast iron pan flaking
That is just the seasoning - the nonstick carbon that is formed after years of use - coming off. If big pieces are dropping in your food or you are freaked out by it, simply give your pan a good scrubbing with some steel wool and soap then re-season it.

To season the pan:


Take a paper towel and soak a bit of oil into it
Coat the inside of the pan with oil
Put in a 250F over for about an hour
Repeat each day until it has a nice shiny non-stick coating once again


Remember not to wash the pan with soapy water if you want the pan to stay non-stick. If there are bits of food in it from frying or such. Scrub it out with hot water and some coarse kosher salt, just nothing like steel wool, non-stick safe scrubbers are OK.

Adam