Causation is the link between someone’s careless act and another person’s injury. In a personal injury case, it is not enough to show that someone acted carelessly. You also have to show that their actions caused your harm.
For example, if a driver runs a red light in Bell, California, and crashes into your car, that driver may be responsible for the injuries caused by the crash. But if the insurance company argues your pain came from an old injury, causation may become a key issue.
What Does Causation Mean in a Personal Injury Case?
Causation answers a basic question: Did the defendant’s conduct cause the injury or loss? This question can come up in car accidents, truck crashes, pedestrian accidents, slip and falls, dog bites, and other injury claims.
Most California personal injury claims rely on a theory of negligence, which requires proving four elements: duty, breach, causation, and damages. California Civil Code § 1714 states that people are generally responsible for injuries caused by their failure to use ordinary care with their property or actions.
Causation connects the breach of duty to the damages. Without that link, there may not be a valid personal injury claim.
What Is the Substantial Factor Test?
California courts often use the “substantial factor” test for causation. California Civil Jury Instruction 430 defines a substantial factor as something a reasonable person would consider to have contributed to the harm. It must be more than a remote or trivial factor.
This does not mean the defendant’s conduct must be the only cause. It means the conduct must have played a real role in causing the injury.
For example, if a distracted driver rear-ends another vehicle, the crash may be a substantial factor in causing whiplash. The injured person does not have to show that no other factor affected their pain. They must show that the crash was a meaningful cause of the harm.
Can There Be More Than One Cause?
Yes. Many injury cases involve more than one cause. California Civil Jury Instruction 431 explains that a person’s negligence may be a substantial factor in causing harm even if another person, condition, or event also contributed to the injury.
For example, two drivers may both make unsafe actions and cause a crash. A property owner may fail to fix a broken stair, while poor lighting also makes the fall more likely. In these cases, more than one party may share responsibility.
Insurance companies sometimes argue that another cause breaks the chain of responsibility. Evidence can help show whether the defendant’s conduct still played a substantial role.
How Do You Prove Causation?
Causation is usually proven with evidence. The right evidence depends on the type of accident and injury involved.
Helpful evidence may include:
- Accident reports
- Photos and videos
- Witness statements
- Medical records
- Doctor’s notes
- Expert opinions
- Vehicle damage records
- Surveillance footage
- Incident reports
- Employment and wage records
This evidence can show what happened, when symptoms started, and how the injury affected your life. It can also help respond to claims that your injury came from something else.
What if I Had a Pre-Existing Condition?
A pre-existing condition does not automatically prevent you from recovering compensation. Many people have old injuries, arthritis, prior surgeries, or other health issues before an accident happens.
The question is whether the accident caused a new injury or made an existing condition worse. For example, a person with past back pain may suffer a herniated disc or a serious flare-up after a crash.
Insurance companies often focus on prior medical records to deny or reduce claims. A doctor or medical expert may help explain the difference between your old condition and the harm caused by the accident.
What Are Common Causation Disputes?
Causation disputes are common in personal injury cases. Insurance companies may accept that an accident happened but deny that it caused the injuries being claimed.
They may argue that:
- Your injury existed before the accident.
- You waited too long to seek medical care.
- The crash was too minor to cause serious harm.
- Your symptoms came from aging or normal wear and tear.
- Another event caused your injury.
- You failed to follow medical advice.
These arguments can affect settlement talks. Strong records, consistent treatment, and clear medical opinions can help protect your claim.
Contact Our Bell Personal Injury Lawyers at Matadores Accident & Injury Lawyers for a Free Consultation
If you were injured in Bell, CA, causation may be one of the most important parts of your case. An attorney can review the facts, gather evidence, work with medical providers, and respond when the insurance company disputes the cause of your injuries.
The attorneys at Matadores Accident & Injury Lawyers can help you understand your options after an accident. Call today to schedule a free consultation and learn how a Bell personal injury lawyer can help with your claim.
Visit Our Personal Injury Law Office in Bell, CA
Matadores Accident & Injury Lawyers – Bell Office
4316 Gage Ave, Bell, CA 90201
(323) 402-1000
Open 24/7
Find us with our GeoCoordinates: 33.9782814,-118.1910158
Matadores Accident & Injury Lawyers – Porterville Office
320 W Putnam Ave, Porterville, CA 93257
(559) 500-1000
Open 24/7
Find us with our GeoCoordinates: 36.0696906,-119.0242167
