6. Your allergies.
You don't have to have a hardcore allergy to flare up when spring comes or when you take a bite of a new dish. There are different severity levels of allergies, which can range from mild to serious. Additionally, you can develop allergies later in life, so it's best to check in with your physician every so often to make sure your immune system is still okay with your roommate's cat or the outdoor pollen. Staying on top of which medications, foods and other triggers cause a reaction can be life saving.