The answer to 'why is my ant invasion' is that ants typically invade homes in search of food, water, and shelter. Common causes include crumbs or spills, leaks, and cracks or crevices that provide entry points. Symptoms include seeing ants in the kitchen, bathroom, or other areas, as well as finding ant trails or nests.
To solve an ant problem, first try DIY methods like sealing entry points, removing food sources, and using bait traps or insecticidal sprays. However, if the infestation is widespread or you can't locate the nest, it's best to call a professional pest control technician. They have the expertise and equipment to fully eliminate the ant colony and prevent future invasions.