Mold spores are very small and lightweight, so they can travel through the air easily. If there is mold downstairs in your home, it is possible for the spores to travel upstairs and cause a new mold problem.
You can help prevent this by keeping your home clean and free of mold growth. Make sure to fix any leaks or moisture problems right away, as mold loves damp conditions. You should also keep an eye out for musty odors, which can be a sign of hidden mold growth.