Last Updated: July 2026

Status: Subject to change as litigation and legal standards evolve.

What Is a Mass Tort?

In general, a mass tort is a legal claim brought by many people who were injured in a similar way, often by the same product, substance, or action. Unlike a single lawsuit between two parties, a mass tort involves dozens, hundreds, or sometimes thousands of individuals with comparable injuries or harm.

Key Characteristics of Mass Torts

Mass tort cases often share these features:

• Similar allegations: Many people allege they were harmed by the same product, chemical, drug, or medical device.
• Individual claims: Each person has their own separate case, though the cases are handled together.
• Common facts: The cases usually involve the same defendant(s), the same product or substance, and similar timelines of exposure or use.
• Varying damages: While the injuries may be comparable, the actual harm and losses can differ from person to person.

Mass tort cases may involve allegations about failure to warn (the manufacturer did not provide adequate warnings about risks), design defects (the product was designed unsafely), or manufacturing defects (something went wrong in how the product was made).

What Is an MDL (Multidistrict Litigation)?

The federal court system created a special process called Multidistrict Litigation (MDL) to manage mass torts efficiently. An MDL consolidates many similar lawsuits from different federal courts into one central location.

How an MDL Works

When many similar lawsuits are filed in federal courts across the country, a judicial panel can transfer or consolidate those cases into a single federal district court. This designated court becomes the central hub for all related cases.

Example: If people across the United States sued a medical device manufacturer alleging similar injuries, the federal courts might consolidate those cases into one MDL in a single location. This allows for coordinated discovery, shared expert testimony, and more efficient management.

Why MDLs Exist

MDLs were designed to:

• Avoid duplicated work – Attorneys do not have to file the same evidence and arguments in multiple courts.
• Share discovery – Evidence and information gathered in one case can be used across all cases.
• Speed up resolution – Coordinated handling can reduce delays and make settlement discussions more practical.
• Reduce costs – Centralized management often reduces overall legal expenses.
• Ensure consistency – Similar cases receive similar treatment by the same judge.

Mass Torts vs. Class Actions: Understanding the Difference

People sometimes confuse mass torts and class actions, but they are different legal structures.

Class Actions

In a class action, one or a few people represent an entire group. The court certifies a “class” of similar people, and the representative(s) speak for everyone.

• Who decides: A few representatives make decisions for the whole group.
• One outcome: Everyone in the class receives the same settlement or judgment.
• Individual participation: People may have limited say in settlement negotiations.
• Opt-out option: In some class actions, people can choose to leave and pursue their own claims.

Mass Torts

In a mass tort, each person brings their own individual claim.

• Who decides: Each person (or their attorney) controls their own case.
• Individual outcomes: Each case may settle or proceed to trial separately; settlements can vary based on individual circumstances.
• More control: Individuals have more say in how their case proceeds.
• Coordinated process: Cases are handled together through an MDL to share resources, but each remains separate.

In simple terms: A class action is like one representative suing on behalf of everyone. A mass tort is many separate lawsuits handled together for efficiency.

Real Examples: Active Mass Tort Cases

Attorneys currently handle many mass tort cases involving various products and substances. Here are real examples of cases being managed through the federal court system:

Aqueous Film Forming Foam (AFFF)

What it is: Firefighting foam used to fight fires at airports, military bases, and by firefighters.

Allegations: The foam contains chemicals known as “forever chemicals” that do not break down quickly in the environment. Lawsuits allege these chemicals have been linked to various health conditions, especially certain cancers.

Who may be affected: Firefighters, military personnel, and airport workers are often cited as populations with high exposure due to their occupational use of the product.

Legal status: Cases involving AFFF are being handled in federal courts nationwide.

Asbestos-Related Injuries

What it is: Asbestos is a mineral once widely used in construction, insulation, and manufacturing.

Allegations: When asbestos fibers are inhaled or ingested, lawsuits allege they can cause serious diseases including mesothelioma, lung cancer, and other respiratory conditions.

Who may be affected: Workers in industries such as construction, shipyards, military service, and manufacturing may have been exposed to asbestos before regulations limited its use.

Legal status: Asbestos litigation is among the longest-running mass tort cases in the U.S. court system. Courts have established that occupational exposure, as well as “take-home” or indirect exposure (such as exposure through contaminated clothing), may be relevant to claims.

Breast Mesh Complications

What it is: Surgical mesh products used in breast reconstruction and augmentation procedures.

Allegations: Lawsuits allege certain mesh products may cause complications such as infections, scarring, mesh migration, or the need for removal due to complications.

Who may be affected: People who received surgical breast procedures using specific mesh products.

Legal status: Cases involving breast mesh injuries are being coordinated in federal courts.

Ethylene Oxide (EtO) Exposure

What it is: Ethylene oxide is a chemical sterilization gas used in medical device and pharmaceutical manufacturing.

Allegations: Lawsuits allege that communities and workers near sterilization facilities that emit ethylene oxide have been exposed to this chemical. Plaintiffs allege this exposure is linked to certain cancers and other health conditions.

Who may be affected: Residents living near sterilization or manufacturing facilities, as well as workers at those facilities.

Legal status: The U.S. Environmental Protection Agency (EPA) has regulated ethylene oxide emissions. Litigation alleges health risks from exposure to this substance.

PFAS Water Contamination

What it is: PFAS stands for “per- and polyfluoroalkyl substances” – chemicals often called “forever chemicals” because they do not break down naturally.

Allegations: Lawsuits allege PFAS has contaminated drinking water supplies, especially near military bases and certain manufacturing facilities. Plaintiffs allege exposure to PFAS is linked to various health conditions.

Who may be affected: People who lived or worked in areas with PFAS-contaminated water supplies.

Legal status: PFAS contamination is an ongoing area of federal environmental and health investigation. The U.S. Environmental Protection Agency (EPA) has studied and published materials on PFAS and drinking water safety.

Common Stages of a Mass Tort Case

Mass tort cases typically move through several phases:

Stage 1: Case Filing and Consolidation

Individuals file lawsuits in their home states or in federal court. If many similar cases exist, courts may consolidate them into an MDL.

Stage 2: Discovery

Attorneys exchange evidence, documents, and information. This stage often involves:

• Requests for documents from defendants and other parties.
• Written questions (called interrogatories) and requests for admissions.
• Depositions – interviews under oath where witnesses and parties answer questions.
• Expert reports – analysis from medical, scientific, or technical experts.

Stage 3: Motions and Rulings

Attorneys file legal motions asking the court to make decisions on key issues, for example, whether the defendant can be held liable, or whether scientific evidence is admissible.

Stage 4: Settlement Discussions

Many mass torts settle before trial. Attorneys for plaintiffs and defendants negotiate to reach settlement agreements. Settlements may vary based on individual case facts, injuries, and damages.

Stage 5: Trial (If No Settlement)

If settlement is not reached, some cases may go to trial. However, most mass tort cases resolve through settlement before trial.

Stage 6: Appeals

Either side may appeal court decisions to higher courts.

Statutes of Limitations: Time Limits for Filing

Every state sets a deadline, called a statute of limitations (SOL), for filing a lawsuit. These deadlines vary by state and type of claim.

For example:

• Most states allow 2 years from the date of injury to file a product liability claim.
• Some states use a discovery rule, which starts the clock when a person discovers (or reasonably should have discovered) the connection between an injury and a product or exposure.
• Other states have different rules for different types of claims.

Why this matters: If you believe you have been injured by a product or substance, it is important to understand your state’s deadline. Missing the deadline can mean losing the right to pursue a claim.

Key Legal Terms in Mass Tort Cases

Understanding common terminology can help you follow case developments:

• Plaintiff: The person bringing the lawsuit (the injured party).
• Defendant: The company or person being sued.
• Allegations: Claims made by plaintiffs about what happened and who is responsible. Allegations are not proven facts until supported by evidence or admitted.
• Causation: The legal and scientific question of whether an exposure or product actually caused the alleged injury. Causation often requires medical and scientific evidence.
• Latency: The time between exposure to a harmful substance and the development of disease or injury. For example, asbestos-related diseases may take many years to develop after exposure.
• Liability: Legal responsibility for harm or damages.
• Damages: Money compensation for injury, loss, or harm.
• Settlement: An agreement between parties to resolve a lawsuit without trial, usually involving payment.
• Verdict: A decision by a judge or jury in a trial.

Why Legal Review Matters

Whether you may have a claim depends on your individual circumstances:

• What product or substance were you exposed to?
• How long ago did you use the product or experience the exposure?
• What injury or health condition do you have?
• When were you diagnosed?
• Where do you live, and what are the time limits in your state?
• Do you have medical records documenting your condition?

A legal review can help determine whether your situation may fit within an active mass tort litigation category. A legal review does not guarantee a successful outcome, but it can clarify whether pursuing a claim may be appropriate based on the facts.

Red Bird Legal’s Role in Mass Tort Litigation

Red Bird Legal works with law firms handling mass tort cases across multiple legal categories. The firm assists in case evaluation, intake, and coordinating claims within active MDL proceedings and mass tort campaigns.

Red Bird Legal does not guarantee outcomes or settlements. Each case is unique, and results depend on individual facts, available evidence, applicable law, and jurisdiction.

Important Information About Litigation Status and Legal Standards

The status of related litigation may change as new evidence, court rulings, or regulatory developments emerge. What is described in this page reflects the general landscape as of the date listed above.

Legal and scientific understanding may evolve over time. New studies, expert testimony, or regulatory guidance may change how courts and attorneys approach these claims.

Eligibility depends on individual facts, including:

• Product use or exposure history
• Diagnosis and timing
• Location (residence and where exposure occurred)
• Available medical records and documentation
• Applicable state laws and statutes of limitations

Frequently Asked Questions About Mass Tort Litigation

What is a mass tort lawsuit?

A mass tort is a civil action in which many individuals bring separate lawsuits against one or more defendants over allegedly similar harm, often involving the same product, drug, medical device, or exposure. Each person keeps their own individual case, but the cases are typically handled together for efficiency. Mass tort claims often involve allegations of design defects, manufacturing defects, or failure to warn about known risks. Whether any specific situation may fit within an active mass tort category depends on individual facts.

What is multidistrict litigation, or MDL?

Multidistrict litigation is a federal court procedure created by Congress in 1968 under 28 U.S.C. Section 1407. When similar civil lawsuits involving common questions of fact are pending in different federal courts, the Judicial Panel on Multidistrict Litigation may transfer those cases to a single federal district court for coordinated pretrial proceedings. This process, which the Panel calls centralization, is designed to avoid duplicated discovery, prevent inconsistent rulings, and conserve resources for the parties and the courts.

Who decides whether cases get consolidated into an MDL?

The Judicial Panel on Multidistrict Litigation, or JPML, makes that decision. The Panel consists of seven sitting federal judges appointed by the Chief Justice of the United States, with no two members from the same federal judicial circuit. The JPML holds hearings roughly every two months to consider motions to consolidate. A party may petition the Panel to consolidate cases, or the Panel may initiate the process on its own. At least four of the seven members must concur for any action.

How is a mass tort different from a class action?

A class action and a mass tort are different legal structures. In a class action, one or a few named representatives sue on behalf of an entire certified group, and the outcome typically applies to everyone in the class. In a mass tort, each person brings an individual lawsuit with their own attorney and their own case file. The cases may be coordinated through an MDL for pretrial efficiency, but each remains separate, and any settlement or verdict may vary based on individual facts.

What is a bellwether trial?

A bellwether trial is a test case selected from a large pool of lawsuits in an MDL and taken through a full jury trial. The goal is to give both sides a sample of how juries may respond to the evidence and arguments, which can inform later settlement discussions. Bellwether outcomes do not automatically decide other cases in the MDL. The MDL judge oversees the selection process, and the number of bellwether trials varies by litigation. Some MDLs may hold only a handful.

What is a “tag-along” case in an MDL?

A tag-along case is a lawsuit filed after an MDL has already been created that involves the same or similar questions of fact as the cases already consolidated. When the JPML learns of a tag-along, it typically issues a conditional transfer order sending the case into the existing MDL, where it follows the same schedule and pretrial procedures. Tag-along transfers allow the MDL structure to grow as new plaintiffs file, without requiring a separate consolidation decision for each new case.

Does every mass tort case go to trial?

No. Most mass tort cases resolve through settlement rather than trial. Bellwether trials in an MDL may inform global settlement discussions, and many cases in a large litigation resolve before ever being tried. If pretrial proceedings conclude and cases have not settled or been dismissed, Section 1407 provides that they be remanded to their original transferor courts for trial, though in practice many cases resolve during the MDL phase. Outcomes vary, and no result can be guaranteed.

Disclaimer

This page is for informational purposes only and is not legal advice. Reading this page or submitting a form does not create an attorney-client relationship.

The status of related litigation, legal standards, regulatory guidance, and scientific understanding may change. Eligibility depends on individual facts, including product use or exposure, diagnosis, timing, location, records, and applicable law.

No outcome, settlement, compensation, or recovery can be guaranteed.

If you believe you may have been injured by a product, substance, or exposure, consider speaking with an attorney to discuss your individual situation.

Source Notes

Information in this page is based on:

• Federal court procedures and MDL structure (U.S. Federal Judicial Center)
• State statutes of limitations for product liability (Findlaw Product Liability Resources)
• U.S. Environmental Protection Agency (EPA) materials on AFFF, ethylene oxide, and PFAS
• Occupational Safety and Health Administration (OSHA) materials on workplace exposures
• Federal court dockets and case management orders for active MDLs
• Approved legal intake criteria and case definitions used by attorneys handling mass tort litigation

All claims and allegations referenced reflect how lawsuits characterize alleged harms. Allegations are not proven facts without evidence or admission.

Last Updated: July 2026

Next Review: December 2026

This information is subject to change and should be reviewed regularly as litigation, court rulings, and scientific understanding evolve.