Personal injury is the name given to the branch law that covers any wrong or damage done to another in her person, property, rights, or reputation. A personal injury can happen at work, in a traffic accident, because of a faulty product or a faulty repair, because of a mistake during medical treatment, or because of a slip and fall on a wet floor or pavement.

The personal injury can be physical or psychological but, to be considered actionable, it must occur due to the negligence or unreasonably unsafe actions of an employer, a manufacturer, a doctor, a landlord, or some other person or organization who owes a duty of ordinary care. Examples of personal injury law causes of action include professional malpractice, wrongful birth, wrongful death, liable, slander, trespass, and nuisance.