Medical malpractice typically involves mistakes or errors made by doctors, nurses and hospitals. It can include failing to perform a diagnostic test, failing to properly diagnose and treat a condition, or performing substandard care. This is known as a breach of the standard of care. But, just because a health care provider breached the standard of care, that doesn’t mean you have a claim. You must also prove what is known as causation. That means the breach must have been a cause of your injury, damages or the death of a loved one.