Barbara Bassin wondered if her back pain came from the day her granddaughter didn't want to walk on the hot patio, so she picked her up. Or maybe it came from the day she pushed her grandson's stroller up a big hill at the zoo. As for her ongoing stomach pain, she figured it was caused by something she ate. Since heartburn was her nemesis, she went to a gastroenterologist. At the visit, she asked about her stomach and back hurting at the same time. "Could I be having a heart attack?" Bassin said.