Blood pressure cuffs are vital tools for doctors to determine how healthy your heart is and whether you need treatment. However, like any other tool, they can be dangerous if not used properly. Cuff sizes should fit snugly but not too tightly around your arm to prevent excessive pressure that could cause pain or injury. Cuffs should also be changed for each use to avoid spreading bacteria from one patient to another. Cuffs can be disposable or reusable; most include several replacements cost-effective packaging.