It allows exploration - Taking introductory classes for a different major will allow you to learn about other areas of study, and can open your eyes to new passions.
Might Like Something You Never Thought - Many students change even their major more than once, so while you're searching you might come across something you never thought of.
You’ll be more satisfied - If you’re in a funk in your current major, and thinking of trying out a different one–do it. At the very least, trying a new major will help you sort out some of your interests.
You may not graduate on time - Depending on what major you are switching from and the one you are switching to, the requirements you need to complete in order to graduate can change.
College might end up costing more - If you end up needing to stay an extra semester or year, you’ll have to consider tuition and living costs for that time, beyond other daily expenses.
More Necessary Supplies for New Major - There may also be more supplies needed for your new major, which can be art supplies, lab equipment, calculators, and more.