Unwanted event consequences include: injuries, damage, loss of customers, liability claims, etc. They are barriers to reach results and can be sources to improve management system effectiveness.
An unwanted event could result in loss, ranging from very small to catastrophic depending on circumstances. They can be used to improve the quality of a management system.
Direct causes of accidents, incidents and other type of unwanted events preceding the event that may or does lead to loss. They are also learning sources to make your management system better.