The main types of lawsuits break down first into two systems—civil and criminal—and then, within the civil side, into several familiar categories: personal injury, contract, employment, family, property, defamation, and class action. Each has its own rules for what you have to prove, what you can recover, and how long you have to file. Sorting out which type fits your situation is the first useful step before you talk to a lawyer or spend any money.
Civil Cases and Criminal Cases
The most important line in law runs between civil and criminal cases. A civil lawsuit is brought by a private person or business (the plaintiff) against another private person or business (the defendant), and the goal is usually money or a court order. A criminal case is brought by the government against someone accused of breaking the law, and the goal is punishment: fines, probation, or prison.
The proof required is very different. A civil plaintiff wins by showing their version is more likely true than not—the “preponderance of the evidence” standard. A criminal prosecutor must prove guilt “beyond a reasonable doubt,” a constitutional requirement the Supreme Court set out in In re Winship to guard against wrongful convictions.1Congress.gov. Amdt14.S1.5.5.5 Guilt Beyond a Reasonable Doubt
The two systems can run at the same time over the same conduct. The constitutional ban on double jeopardy applies only to criminal prosecutions, so someone acquitted of a crime can still be sued civilly for the same acts. This comes up often in assault, fraud, and wrongful death claims.
Personal Injury Lawsuits
Personal injury is probably what most people picture when they hear “lawsuit.” You file one when someone else’s careless or intentional conduct causes you physical harm, emotional distress, or both. Car crashes, slip-and-falls, medical errors, defective products, and wrongful death all live here.
Damages split into three categories. Economic damages cover measurable losses: medical bills, lost wages, property repair. Non-economic damages cover harder-to-measure harms like pain, emotional suffering, and lost enjoyment of life. In cases involving especially reckless or intentional conduct, courts may add punitive damages to punish the defendant and deter similar behavior.
How Shared Fault Affects Your Recovery
Your own role in an accident can shrink or wipe out your award. Most states use comparative negligence: if a jury finds you 30% at fault and the defendant 70%, your award drops by your share. A handful of states still follow contributory negligence, which bars recovery entirely if you bear any fault at all, even 1%. Which system your state uses can decide whether a case is worth pursuing.
How Personal Injury Lawyers Charge
Most personal injury attorneys work on contingency. They take a percentage of the recovery instead of billing by the hour, usually 33% to 40% on a sliding scale—lower if the case settles early, higher if it goes to trial. You generally pay nothing if the attorney doesn’t win, but ask upfront whether you still owe court costs and expenses regardless of outcome.
Contract Lawsuits
A contract lawsuit starts when one party fails to perform a legally binding agreement. The breach can be as simple as not paying an invoice or as involved as delivering products that miss the agreed specifications. Commercial leases, employment agreements, service contracts, real estate deals, and sales of goods all produce these disputes.
The default remedy is compensatory damages—enough money to put the non-breaching party where they would have been if the contract had been performed. When money cannot fix the problem, as with a unique piece of real estate, a court may order specific performance, forcing the breaching party to actually do what they promised.
One rule trips people up. If someone breaches a contract with you, you cannot sit back and let losses pile up. Courts expect reasonable steps to limit the damage. A landlord whose tenant walks away from a lease is expected to try to find a new tenant. A contractor whose project is canceled cannot keep ordering materials and billing for them. Ignoring this duty to mitigate can cost you a significant part of your claim.
Employment Lawsuits
Employment disputes are among the most frequently filed civil cases. The best known involve discrimination: federal law prohibits firing, refusing to hire, or otherwise penalizing workers because of race, color, religion, sex, or national origin.2EEOC. Title VII of the Civil Rights Act of 1964 Separate federal statutes extend protection to age, disability, and genetic information.
Other common employment claims include wrongful termination (being fired in violation of a labor law, an employment contract, or company policy), retaliation for reporting harassment or unsafe conditions, and wage disputes over unpaid overtime or withheld pay.3USAGov. Wrongful Termination Whistleblower protections shield employees who report illegal activity, safety violations, or fraud to agencies like OSHA, the SEC, or the IRS.
Watch one procedural trap. For most federal discrimination claims you cannot go straight to court. You must first file a charge with the Equal Employment Opportunity Commission, and the deadlines are strict.4EEOC. Filing a Charge of Discrimination Missing that window can kill an otherwise valid claim.
Family Law Cases
Family law has its own corner of the civil system, with specialized courts in most jurisdictions. The guiding principle in any matter involving children is the child’s best interests, a standard that gives judges wide discretion over custody, visitation, and support.
Divorce is the most common family proceeding. It typically involves dividing marital property, setting spousal support, and establishing custody. Child custody disputes decide where a child lives and who makes major decisions about education, health care, and religious upbringing. Child support orders set each parent’s financial obligation based on income, number of children, and the custody arrangement.
Family courts also handle adoption, paternity, guardianship of minors or incapacitated adults, and domestic violence protective orders. Protective order cases often move on an accelerated timeline because of immediate safety concerns—a court can issue a temporary order within hours and schedule a full hearing within days.
Property Lawsuits
Property disputes involve ownership, use, boundaries, or damage to real estate and personal belongings. Common examples include boundary disputes between neighbors, landlord-tenant conflicts over evictions or security deposits, damage to your property by a third party, and quiet title actions that establish who actually owns a piece of land.
One of the more surprising claims is adverse possession. Someone who openly occupies another person’s land for a long enough period can gain legal title to it. The required period varies widely by state, from as few as five years to twenty or more, and the possession must be continuous, open, and without the true owner’s permission. The doctrine sounds exotic, but it comes up more than you would expect in disputes over fences, driveways, and outbuildings.
Defamation Lawsuits
A defamation claim arises when someone makes a false statement of fact about you, communicates it to others, and your reputation is damaged as a result. Written defamation is libel; spoken defamation is slander. Either way, you generally need to show four things: the statement was false, it was published or spoken to a third party, the speaker was at least negligent about the truth, and you suffered real harm.
Public figures face a harder road. Under the Supreme Court’s New York Times v. Sullivan framework, a public official or public figure must prove “actual malice”—that the speaker knew the statement was false or acted with reckless disregard for whether it was true. That standard is deliberately difficult to meet. For private individuals, ordinary negligence is usually enough.
Class Action Lawsuits
When many people suffer the same type of harm from the same defendant, a class action lets one or a few plaintiffs represent the whole group. Defective consumer products, data breaches, securities fraud, and deceptive billing practices are typical examples. Individual claims might be too small to justify separate lawsuits, but the combined harm can be enormous.
Federal courts require a class action to meet four conditions: the group must be large enough that joining everyone individually would be impractical, there must be legal or factual questions common to the class, the representatives’ claims must be typical of the group’s, and the representatives must be able to fairly protect the class’s interests.5Legal Information Institute. Federal Rules of Civil Procedure Rule 23 – Class Actions If the court certifies the class, the lawsuit proceeds on behalf of everyone who fits the definition.
Most class actions settle rather than go to trial. When they do, class members receive notice and typically have the right to opt out, meaning you can exclude yourself from the settlement and pursue your own claim if your individual damages justify it. Staying in the class means accepting whatever the settlement provides and giving up the right to sue separately.
Small Claims Court
Not every dispute needs a full lawsuit. Small claims courts handle lower-value civil cases—usually amounts between a few thousand dollars and $25,000, depending on the state—using simplified procedures. You generally do not need a lawyer, the rules of evidence are relaxed, and cases move much faster than in regular civil court. Unpaid debts, minor property damage, security deposit disputes, and small contract breaches fill most small claims dockets.
The trade-off is limited remedies. Small claims courts almost always award only money, not injunctions or specific performance. If your claim exceeds the dollar cap, you have to either reduce your demand to fit or file in regular civil court.
Deadlines That Apply to Every Type
Every lawsuit has a deadline, called the statute of limitations, and missing it usually kills the claim no matter how strong it is otherwise. The length depends on the type of case and the state. Personal injury claims typically run between one and six years. Written contract disputes generally allow between three and fifteen years, and oral contracts often get a shorter window. For federal civil claims created by statutes enacted after 1990, the default deadline is four years.6Office of the Law Revision Counsel. 28 U.S. Code 1658 – Time Limitations on the Commencement of Civil Actions Arising Under Acts of Congress
The clock usually starts when the harm occurs. An important exception, the “discovery rule,” can delay it. If you could not reasonably have known about the injury at the time—say a surgeon left an instrument inside you and it wasn’t found for years—the deadline may not start until you discovered the problem or reasonably should have. Not every state applies the discovery rule to every type of claim, so do not assume it will rescue a late filing.
When a Lawsuit Isn’t an Option
Court is not always available. Many contracts—employment agreements, consumer purchases, insurance policies, medical service agreements—include mandatory arbitration clauses that require disputes to be resolved outside the court system.
Mediation and arbitration are the two main alternatives, and they work very differently. In mediation, a neutral third party helps the sides negotiate a resolution, but the mediator cannot impose a decision. Nothing is binding unless both parties agree. Arbitration is closer to a private trial: an arbitrator hears evidence and arguments, then issues a decision that is almost always final and legally binding, with no right to appeal.
Mandatory arbitration clauses deserve a careful read before you sign anything. They typically waive your right to a jury trial, limit the information you can obtain from the other side, and often prohibit class actions. Proceedings are private, so there is no public record and no precedent for future cases. Arbitrator fees can run hundreds of dollars per hour, and unlike a contingency-fee lawsuit, you may need to pay your share upfront. Courts have generally enforced these clauses under the Federal Arbitration Act, even when they override state consumer protection laws.