If you live in the Los Angeles area, please join 89.3 KPCC on Saturday, May 13 for a panel discussion on what makes a medical condition "invisible": What is unique about the suffering of someone who has R.A. or chronic migraine headaches? What challenges does that person face in communicating her or his condition to a health provider? And is this a matter of public health?

Conditions like cancer, heart disease and AIDS strike fear into the…