Excessive indoor humidity increases your risk for mold exposure. Mold can grow on virtually anything, including behind walls in framing, on soap-coated grout, and in carpet pads and the carpet itself. Exposure to high levels of household mold is enough to trigger your symptoms.
Excessive moisture can be caused by leaky pipes, water seepage during the rainy season, and even flood damage. All of these conditions allow mold to grow and are likely to irritate your skin and respiratory system.