Food Safety Report: Pancheros Mexican Grill - Mason City, 4th Street Southwest, Mason City, IA, USA 2 years ago • details 10 Comments Comment Suspected food poisoning. Symptoms: Nausea, Fever, Stomach Pain, Chills, Headache Suspected source: pico Onset: 4 to 12 hours Duration: 12 to 24 hours Sick: Me