Aspirin has many uses, so it's important to keep a bottle on hand in case of minor injury or a major health emergency. Aspirin alleviates headaches and muscle pain, cramps, and even some arthritis pain. It also reduces fevers. Taking half of a regular strength aspirin once a day may decrease the risk of a heart attack or stroke. With all the different ways aspirin can help with health and medical concerns, it's smart to always have a bottle of aspirin at the ready.