A flooded upstairs bathroom can be a stressful and potentially damaging situation. It is important to turn off the water supply to prevent further flooding. If the flooding is severe, it may be necessary to call a professional plumber or water restoration company to assess the damage and begin the cleanup process. If the flooding is minor, towels and a wet/dry vacuum can be used to remove excess water. It is also important to thoroughly dry any affected areas to prevent mold growth. Regular maintenance and inspections of plumbing fixtures can help prevent future incidents.