Common signs of mold in your home include visible black, green, or white spots on walls, ceilings, or other surfaces, and a persistent musty odor. You may also notice water damage such as stains or discoloration, excessive condensation, peeling paint or wallpaper, and warped or damp materials. Additionally, mold exposure can cause allergic reactions like sneezing, coughing, itchy eyes, or skin irritation.