Why service connection matters
Without service connection, the VA will not pay disability compensation for a condition, even if it is severe. Most claims start by proving three elements: a current diagnosis, an in service event or exposure, and a medical nexus linking them, unless a presumption applies.
Direct service connection
Direct service connection ties a condition to an injury, illness, or event that happened during service. Evidence often includes service treatment records, private treatment after separation, and medical opinions.
Secondary service connection
A secondary condition is caused or aggravated by a condition that is already service connected. Common examples are discussed in clinical records and require medical reasoning.
Presumptive service connection
Certain exposures, locations, or time periods create presumptions that reduce some proof burdens. Presumptions still require a current qualifying diagnosis where regulations say so.
How this site can help
Use guides on filing, nexus letters, and secondary issues alongside this definition. Always verify current law and your specific facts with an accredited representative.
More resources
Try the VA disability calculator, browse VA condition guides, or read in-depth articles.
This information is for educational purposes only and is not legal or medical advice. Rating criteria are summarized from publicly available 38 CFR regulations. Consult a Veterans Service Officer (VSO) or VA-accredited attorney for advice on your specific claim.