My wonderful girlfriend used to ride a bike in college for nearly 2 years. She had a quality, entry-level Trek hybrid with an upright-riding style. Around the time she started riding, she started getting pain radiating from her right foot all the way to her back. For a long time, she didn't consider that it had anything to do with her cycling. After 2 years, she couldn't take the pain any longer. A doctor diagnosed her with piriformis syndrome but did not connect the pain to the cycling either. Finally, my girlfriend realized the pain started when she started cycling, and quit riding her bike. The pain went away immediately and has not come back since. It's been 3 years since she stopped riding.
Does anyone have any advice on what she could try to be able to ride a bike again? Has anyone encountered problems with piriformis syndrome and cycling before? She would like to at least be able to ride a bike around the neighborhood, to the pool, or the commuter train station. However, any pain like before would be a deal breaker.