How the conditions may be related
Erectile dysfunction is among the most common and severe quality-of-life consequences of prostate cancer treatment, affecting 60–90% of men treated with radical prostatectomy and 25–60% treated with radiation therapy. Radical prostatectomy — even nerve-sparing — damages the cavernous nerves (branches of the pelvic splanchnic nerves) that course along the posterolateral prostate and mediate reflexogenic erection. Radiation therapy causes progressive obliterative endarteritis of the cavernous arteries and radiation fibrosis of the corpus cavernosum and penile neurovascular bundle. Androgen deprivation therapy (ADT) suppresses testosterone to castrate levels, abolishing both libido and erectile function via hypothalamic-pituitary-gonadal axis suppression. ED following prostate cancer treatment is expected, universal, and a medically established direct complication requiring no nexus letter in many cases.
“Disability which is proximately due to or the result of a service-connected disease or injury shall be service connected.”
A disability may qualify for secondary service connection when evidence shows that an existing service-connected condition caused it or increased its severity beyond natural progression. These are the causation and aggravation paths in 38 CFR § 3.310. Having both conditions does not, by itself, establish the connection.
Look at the evidence behind the pairing
- Sanda MG et al. (2008) N Engl J Med (prostate cancer treatment outcomes)
- Resnick MJ et al. (2013) N Engl J Med (RP vs radiation ED long-term)
- Capogrosso P et al. (2019) Eur Urol (ED after prostate cancer treatment)
- Kim ED et al. (2001) Urology (nerve-sparing RP and ED).
Strong, Moderate, and Emerging are research categories assigned within this library. They are not VA determinations, promises of service connection, or estimates of your approval chances. Read the supporting research and consider how it applies to your own history. Association between conditions does not, by itself, establish that one caused or aggravated the other.
Build the link to your own history
A nexus is the link between the two conditions. Relevant evidence can include medical records, a reasoned medical opinion, and, in some circumstances, lay evidence. A private nexus letter can help, but is not universally required. An opinion should explain how the evidence in your case supports causation or aggravation, rather than only naming a possible association.
VA may arrange a C&P examination or request a medical opinion when needed to decide an initial or Supplemental Claim. You can submit an opinion from a treating or independent clinician, but VA does not require everyone to purchase a private nexus letter. Its duty to assist does not guarantee a favorable opinion or a granted claim.
Pairing-specific research notes
This is one of the strongest and most straightforward secondary cancer-treatment claims. Prostate cancer treatment records (operative report for RP, radiation treatment plan/dosimetry records, ADT prescription records) directly establish the treatment nexus. Urology records documenting post-treatment ED evaluation and treatment. File for SMC-K separately. A nexus letter is generally easy to obtain and may not even be required given the well-established causal relationship documented in medical literature and treatment informed-consent documents.
A diagnosis does not guarantee an additional rating
A separately compensable secondary disability may receive its own evaluation, which VA combines with other ratings under 38 CFR § 4.25. Separate diagnoses do not always mean separate ratings: § 4.14 prohibits compensating the same manifestations more than once, and some body systems have additional rating rules. For aggravation, the compensable increase must account for the baseline severity.
The formula applies the whole-person concept: a 50% combined existing rating plus a new 30% rating yields 65% (rounded to 70%), not 80%.
This example starts with an unrounded combined value. If your current award was already rounded, use your individual ratings to calculate the new total. VA rounds to the nearest ten only after combining all applicable ratings.
Read the combined ratings ruleBoth causation and aggravation are forms of secondary service connection. Aggravation means an increase in severity attributable to a service-connected condition, beyond natural progression. Permanent worsening is not required under Ward v. Wilkie (2019). Section 3.310(b) also requires medical evidence establishing a baseline level of severity; VA deducts the baseline and any natural progression when determining the compensable increase.
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See how separately assigned ratings combine using VA math.
Open the calculatorSecondary claims, explained
What is a secondary service-connected condition?
A disability may qualify for secondary service connection when evidence shows that an existing service-connected condition caused it or increased its severity beyond natural progression. These are the causation and aggravation paths in 38 CFR § 3.310. Having both conditions does not, by itself, establish the connection.
What evidence can establish the connection?
A nexus is the link between the two conditions. Relevant evidence can include medical records, a reasoned medical opinion, and, in some circumstances, lay evidence. A private nexus letter can help, but is not universally required. An opinion should explain how the evidence in your case supports causation or aggravation, rather than only naming a possible association.
Do I have to pay for a private nexus letter?
VA may arrange a C&P examination or request a medical opinion when needed to decide an initial or Supplemental Claim. You can submit an opinion from a treating or independent clinician, but VA does not require everyone to purchase a private nexus letter. Its duty to assist does not guarantee a favorable opinion or a granted claim.
Does aggravation have to be permanent?
Both causation and aggravation are forms of secondary service connection. Aggravation means an increase in severity attributable to a service-connected condition, beyond natural progression. Permanent worsening is not required under Ward v. Wilkie (2019). Section 3.310(b) also requires medical evidence establishing a baseline level of severity; VA deducts the baseline and any natural progression when determining the compensable increase.
Will a secondary condition get a separate rating?
A separately compensable secondary disability may receive its own evaluation, which VA combines with other ratings under 38 CFR § 4.25. Separate diagnoses do not always mean separate ratings: § 4.14 prohibits compensating the same manifestations more than once, and some body systems have additional rating rules. For aggravation, the compensable increase must account for the baseline severity.
When can a secondary claim’s effective date begin?
An effective date generally depends on when VA received the claim and when entitlement arose, with exceptions. A qualifying intent to file may preserve an earlier claim date if VA receives the completed claim within one year. Review deadlines and continuous pursuit can affect the date; a prior denial does not automatically establish an earlier effective date.