1. Introduction

Breach causation is the legal requirement that a defendant’s breach of a duty, contract, statute, or other legal obligation must have caused the harm or loss for which the claimant seeks a remedy.

A defendant may have acted negligently or violated a legal duty, but that violation does not automatically establish liability for every subsequent injury or financial loss. The claimant generally must establish a legally sufficient connection between the breach and the damage.

Courts examine three related questions:

Breach: Did the defendant violate a legally recognised duty or obligation?

Factual causation: Did the breach actually contribute to the harm?

Legal causation: Is the harm sufficiently connected to the breach for the law to impose responsibility?

The precise test varies according to the jurisdiction and the type of claim. The following discussion focuses primarily on Indian law, with important English and other common-law authorities for comparison.

2. Meaning and legal foundations

Breach causation is an essential component of civil liability in negligence, medical malpractice, product liability, environmental injury and breach-of-contract claims.

For example, suppose a hospital negligently delays treatment, but reliable medical evidence establishes that the patient would have died even if treatment had been provided promptly. The hospital may have breached its duty, yet the claimant may be unable to establish that the breach caused the death.

This distinction is illustrated by Barnett v Chelsea and Kensington Hospital Management Committee [1969] 1 QB 428. The hospital's failure to examine the patient was negligent, but the claim failed because the evidence showed that prompt treatment would not have prevented the death.

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The governing principle is that wrongdoing and causation are separate requirements. Courts must determine not merely whether a defendant acted unlawfully, but whether the particular loss claimed is attributable to that conduct.

3. Principal judicial standards

A. The “but-for” test

The but-for test asks:

Would the harm have occurred but for the defendant’s breach?

If the harm would probably not have occurred without the breach, factual causation is ordinarily established. If the same harm would have occurred anyway, the breach ordinarily fails this test as a cause of that harm.

Leading case: Barnett [1969] 1 QB 428

The patient died from arsenic poisoning after the hospital failed to examine him. The evidence established that medical intervention would not have saved him. The negligence therefore did not cause the death in the legally relevant factual sense.

Judicial significance: Proof of breach alone cannot substitute for proof of causation.

The UK Supreme Court reiterated the ordinary approach in Davies v Bridgend County Borough Council [2024] UKSC 15. The court explained that the test asks whether the relevant damage would have occurred without the breach.

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B. Material contribution to harm

Sometimes a claimant's injury results from multiple contributing factors. A defendant need not always be the sole cause of the damage.

The material-contribution approach asks whether the breach made a legally significant contribution to the injury, subject to the rules applicable to the particular claim.

Leading case: Bonnington Castings Ltd v Wardlaw [1956] AC 613

A worker developed pneumoconiosis after exposure to dust from both culpable and non-culpable sources. The House of Lords held that liability could arise where the wrongful exposure materially contributed to the disease.

Principle: A defendant cannot necessarily avoid liability merely because other factors also contributed to the injury.

However, an increase in risk is not automatically equivalent to proof of causation in every case. The applicable doctrine depends on the type of harm and the evidence.

C. Increased-risk and exceptional causation standards

In certain cases, scientific uncertainty makes it difficult to establish precisely which exposure caused an injury. Courts may exceptionally modify ordinary causation requirements.

Leading case: Fairchild v Glenhaven Funeral Services Ltd [2002] UKHL 22

Several employers negligently exposed workers to asbestos, and the workers developed mesothelioma. It was scientifically impossible to identify which exposure had caused the disease.

The House of Lords allowed an exceptional approach under which a defendant's material contribution to the risk could satisfy the causation requirement in the particular circumstances.

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The exception is narrow. It does not establish that every negligent act that increases a risk is legally deemed to have caused the eventual injury.

D. Multiple possible causes

Where several possible causes exist, courts must distinguish between a breach that actually caused the damage and one that merely coincided with it.

Leading case: Wilsher v Essex Area Health Authority [1988] AC 1074

A premature infant suffered an injury that could have resulted from several different medical or physiological factors. The defendant's breach was one possible explanation among multiple independent causes.

The House of Lords rejected the proposition that increasing the risk of injury was, by itself, enough to establish causation on those facts.

Principle: The claimant ordinarily must prove the legally required causal connection; a mere possibility that the breach caused the injury is insufficient.

This distinction between Fairchild and Wilsher is particularly important in medical negligence and scientific injury litigation.

4. Important Indian case laws on breach causation

1. Jacob Mathew v. State of Punjab (2005) 6 SCC 1

Supreme Court of India

The Supreme Court explained that negligence requires duty, breach and resulting damage. Medical negligence must be assessed by reference to the appropriate professional standard, and criminal negligence requires a substantially higher degree of fault than ordinary civil negligence.

Relevance to causation: A medical error or an adverse outcome does not, by itself, establish that a breach caused the injury. The evidence must establish the legally required connection between the conduct and the result.

The judgment also distinguishes civil liability from criminal responsibility.

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2. M.S. Grewal v. Deep Chand Sood (2001) 8 SCC 151

Supreme Court of India

This case concerned the deaths of schoolchildren during a school picnic. The Court examined the responsibility of school authorities and the teachers entrusted with the children's safety.

The judgment discusses the essential elements of negligence, including duty, breach, causal connection and remoteness of damage.

Legal principle: Where a person or institution assumes responsibility for the safety of others, a failure to take appropriate precautions may result in liability if the necessary causal connection with the harm is established.

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3. Dr. Laxman Balkrishna Joshi v. Dr. Trimbak Bapu Godbole (1969) 1 SCR 206

Supreme Court of India

The Supreme Court explained that a medical practitioner owes duties concerning whether to undertake treatment, what treatment to provide, and how to administer it.

The case concerned a fracture-treatment procedure and the failure to take an elementary precaution before manipulating the fracture.

Legal principle: A breach of professional duty may support liability where the resulting injury is causally connected to the failure to exercise reasonable care. The precise causal connection must be assessed from the facts and evidence.

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4. Kurban Hussein Mohammedali Rangawalla v. State of Maharashtra AIR 1965 SC 1616

Supreme Court of India

This decision is important for criminal causation. The Court considered whether the accused's allegedly negligent conduct had the necessary causal relationship with deaths arising from a fire.

The relevant principle is that criminal negligence requires more than proof that an accused acted carelessly: the act must have the legally required causal connection with the death.

The judgment is particularly relevant to prosecutions for causing death by a rash or negligent act. It should be distinguished from the lower threshold that may apply to civil compensation claims. See also Jacob Mathew.

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5. Legal causation and intervening events

Even when factual causation is established, a court must decide whether the defendant should legally be held responsible for the resulting harm.

An intervening event, often described as a novus actus interveniens, may break the chain of causation where it is sufficiently independent and legally significant.

Examples include:

An independent act of a third party.

An unforeseeable event that becomes the effective cause of the loss.

A claimant's conduct that materially affects responsibility for the injury.

A subsequent medical complication or separate accident.

These events do not automatically break the chain. Courts consider whether the intervening event was foreseeable, whether the original breach remained an operative cause, and the purpose and scope of the duty breached.

In Fairchild, the House of Lords emphasised that causation rules define the extent of responsibility for harm, rather than operating as purely scientific tests.

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6. Burden and standard of proof

The party alleging breach causation ordinarily bears the burden of establishing the relevant facts, subject to statutory provisions and recognised evidentiary presumptions.

In India, Jacob Mathew is especially important because it distinguishes civil negligence from criminal negligence. The evidentiary burden and substantive requirements depend on the particular cause of action and offence.

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7. Breach causation in different areas of law

Medical negligence

Courts assess whether appropriate treatment, diagnosis or monitoring would probably have prevented the injury or improved the outcome in a legally relevant way. Expert evidence may be essential.

Industrial and environmental injury

Courts assess exposure records, scientific evidence, alternative causes and whether the defendant's conduct caused or materially contributed to the damage under the applicable legal doctrine.

Breach of contract

The claimant must establish that the breach caused the claimed loss. Foreseeability, remoteness, mitigation and contractual allocation of risk may further limit recoverable damages.

Constitutional and public-law claims

Courts examine whether unlawful government action caused a legally recognised injury and whether the requested remedy is justified. The applicable standards may differ from private-law negligence.

8. Evidence used to establish causation

Courts may consider several forms of evidence, depending on the dispute:

Expert testimony: Medical, engineering, scientific or economic opinions explaining how the injury or loss occurred.

Contemporaneous records: Medical files, inspection reports, contracts, incident logs and correspondence.

Chronology: Whether the harm followed the breach in a manner consistent with the alleged causal mechanism.

Counterfactual evidence: What probably would have happened if the defendant had complied with the relevant duty.

Alternative explanations: Whether another cause better explains the damage.

Statutory presumptions: Whether legislation shifts a burden or permits an inference in the particular circumstances.

Chronological sequence alone does not prove causation. Equally, the existence of alternative causes does not automatically defeat a claim where the governing law permits liability for a material contribution.

9. Critical judicial principles

The principal authorities support six propositions:

Breach is not enough: A legal violation does not automatically establish liability for subsequent damage.

Causation is distinct from fault: The court must separately examine whether the breach caused the loss.

Sole causation is not always required: Several acts or exposures may contribute to the same injury.

Increased risk is not universally sufficient: Exceptional causation rules are confined to the circumstances in which they have been recognised.

Legal responsibility has limits: Remoteness and intervening causes may restrict liability even when factual causation exists.

The standard depends on the claim: Civil negligence, criminal negligence, contract and statutory liability may require different analyses.

10. Conclusion

Judicial standards for breach causation provide the link between wrongful conduct and legal responsibility. The ordinary approach requires proof that the breach caused the damage, commonly through the but-for test, while recognised doctrines address material contribution, multiple causes and exceptional scientific uncertainty.

In India, Jacob Mathew, M.S. Grewal and Dr. Laxman Balkrishna Joshi provide important foundations for analysing negligence and resulting injury. Comparative authorities such as Barnett, Bonnington Castings, Wilsher and Fairchild explain how courts distinguish factual causation, material contribution and exceptional risk-based reasoning.

Ultimately, the governing question is not merely whether a breach occurred, but whether the applicable legal standard connects that breach to the particular harm for which a remedy is sought.

Scope note: This is a general legal explanation, not a case-specific opinion. The precise standard depends on the jurisdiction, cause of action and applicable legislation.