If your basement flooded, roof leaked, or a broken pipe sprayed water all over, you need to inspect for mold. Any place that got wet and was not quickly dried (within 24 to 48 hours) could become contaminated by mold.
Water damage can plant seeds of severe damage. If you had water damage at any point, from seasonal storms, a leaky roof, burst pipe, or other issues, and the water was not verified to be completely dry within 24 hours, there is a good chance that there is some degree of mold present. Once the mold is present, it can spread in times of increased moisture. If you’ve recently had any kind of water or flood damage, contact a professional mold tester.