One of the most important and often most challenging aspects of bringing a claim against the Ministry of Defence (MOD) is proving causation. Even where an injury is clear, a claim will not succeed unless it can be shown that the harm was caused, or materially contributed to, by the MOD’s actions or failures.
In many military injury claims, the central issue is not whether an injury occurred, but whether that injury can be legally linked to service. This is particularly relevant in cases involving delayed symptoms, pre-existing conditions, or complex medical histories.
At Howe & Co, we assist service personnel and veterans in establishing causation in military injury claims, ensuring that evidence is properly structured and clearly presented.
What Is Causation in Legal Terms?
Causation refers to the requirement to prove that the MOD’s breach of its duty of care directly caused, or significantly contributed to, the injury.
It is not enough to show that something went wrong. A claimant must demonstrate that, on the balance of probabilities, the injury would not have occurred but for the MOD’s negligence.
This is often referred to as the “but for” test.
The Role of Evidence in Proving Causation
Causation is an evidence-driven issue. The court will consider both factual and medical evidence when determining whether the injury is linked to service.
| Type of Evidence | Role in the Claim |
| Medical Records | Establish diagnosis and timeline of symptoms |
| Expert Reports | Provide opinion on cause and prognosis |
| Service Records | Confirm exposure to risk or relevant conditions |
| Incident Reports | Detail how the injury occurred |
| Witness Evidence | Support factual account of events |
In many cases, proving MOD negligence depends heavily on expert medical opinion, particularly where the connection between service and injury is not immediately obvious.
Common Challenges in Military Causation Cases
Establishing causation can be difficult in a number of situations, particularly where there are competing explanations for the injury.
Common challenges include:
- Pre-existing medical conditions that may have contributed to the injury
- Delayed onset of symptoms, making the timeline less clear
- Multiple potential causes, including civilian employment or lifestyle factors
- Lack of contemporaneous medical records
- Disputes between medical experts
In these cases, the issue is not simply whether the injury exists, but whether it can be reliably attributed to military service.
Material Contribution and Partial Causes
The law recognises that injuries may have more than one cause. A claim can still succeed if it can be shown that the MOD’s actions made a material contribution to the harm.
This means that even if other factors were involved, a claimant may still succeed if the MOD’s breach played a meaningful role in causing or worsening the condition.
This principle is particularly important in service connection injury evidence, where injuries develop over time or arise from repeated exposure.
Linking Injury to Military Service
In practice, proving causation often involves building a clear narrative that connects service conditions to the injury.
This may include demonstrating:
- Exposure to a known risk during service
- A consistent timeline between exposure and symptoms
- Absence of alternative explanations
- Medical opinion supporting the connection
Establishing this link is central to successful military injury claims, particularly where the MOD disputes liability.
How Howe & Co Can Help
Causation is often the deciding factor in whether a claim succeeds or fails. At Howe & Co, we work closely with clients and independent experts to gather and present the evidence needed to support causation in military injury claims.
If you are unsure whether your injury can be linked to your service, obtaining legal advice can help clarify your position and ensure that the right evidence is obtained at an early stage.
If you would like to disucss a potential military claim, contact our team.
