How the conditions may be related
Erectile dysfunction (ED) in PTSD-affected veterans results from multiple concurrent mechanisms. Chronic HPA-axis activation suppresses hypothalamic-pituitary-gonadal axis function, reducing testosterone levels essential for libido and erectile function. Sympathetic nervous system hyperactivation (elevated norepinephrine) causes sustained vasoconstriction of penile arterioles, directly impairing the parasympathetically-mediated vasodilation required for erection. Psychiatric medications commonly used for PTSD independently cause sexual dysfunction as a side effect, and this medication pathway is part of the same claim rather than a second one: SSRIs raise hypothalamic serotonin, which tonically inhibits the dopaminergic pathways driving desire and orgasm through 5-HT2A and 5-HT3 receptors; SNRIs add alpha-adrenergic vasoconstriction of genitourinary smooth muscle; antipsychotics raise prolactin, which suppresses gonadal function. Reported rates of SSRI-associated sexual dysfunction run from 30 to 70 percent in systematically assessed cohorts, and the presentation can include delayed ejaculation, anorgasmia and reduced libido as well as erectile dysfunction. PTSD-associated hypervigilance and emotional numbing disrupt sexual arousal neuropsychologically. Studies in OEF/OIF veterans report 30–39% ED prevalence associated with PTSD.
“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
- Helmer DA et al. (2013) J Sex Med (OEF/OIF veterans and ED)
- Breyer BN et al. (2014) Urology (PTSD and sexual dysfunction)
- Letourneau EJ et al. (1997) Behav Res Ther
- Kotler M et al. (2000) J Trauma Stress (sexual dysfunction in combat PTSD)
- Serretti A & Chiesa A (2009) J Clin Psychopharmacol (meta-analysis of antidepressant-associated sexual dysfunction)
- Montejo AL et al. (2001) J Clin Psychiatry.
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
ED is rated separately from PTSD and carries a 0% rating with Special Monthly Compensation (SMC-K) at $139.87/month (2025 rate) if the condition requires regular use of erectile dysfunction medication or cannot be treated. File VA Form 21-526EZ listing ED as secondary to PTSD. Include urology records and testosterone levels. If a PTSD medication contributes, add the prescription record with its onset date, mental health records noting the dysfunction as a treatment side effect, and a nexus letter from the prescribing psychiatrist stating in terms that the dysfunction is a side effect of medication required for service-connected PTSD. The direct pathway and the medication pathway support the SAME secondary claim; you do not file twice. Request SMC-K specifically.
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.