Nexus Letter for Hypertension: What It Must Say
The medical opinion connecting Hypertension (7101) to your service is the piece of the file a rater weighs most heavily. This is what that letter has to contain — and a complete, real example you can read before writing a word.
What a nexus letter is
A nexus letter is a written medical opinion from a licensed clinician stating that a veteran’s condition is “at least as likely as not” (a 50 percent or greater probability) connected to their military service — or to a condition already service-connected. It is the bridge between a diagnosis and service connection: the VA has your diagnosis and your service records, and the nexus opinion is what ties them together with medical reasoning a rater can weigh.
What a Hypertension nexus letter must contain
The diagnosis, by name and code
Hypertension named as a current, documented diagnosis — the condition the VA rates under 38 CFR Part 4, DC 7101 (7101). No diagnosis, no service connection: the opinion has to be about a condition that exists in your records.
The theory of connection
Direct service connection under 38 C.F.R. § 3.303 (the condition began in or was caused by service), or secondary service connection under § 3.310 (a service-connected condition caused or aggravated it). For Hypertension, the secondary path is common — see the mechanisms below — and the letter must name which theory it is using.
The magic words, used correctly
The opinion must be stated to the VA's own standard: "at least as likely as not (a 50 percent or greater probability)." Weaker hedges like "possibly" or "may be related" fail; the standard is a specific legal threshold, and letters that don't invoke it get discounted.
A rationale, not a conclusion
The most common fatal flaw is the conclusory letter — an opinion with no reasoning. A rater is instructed to weigh the rationale: what in the records supports the connection, what the medical literature says about the mechanism, and why known alternative causes don't displace it. For Hypertension specifically: Blood-pressure readings across multiple visits — “predominantly” means the pattern, so one reading is never enough — plus the medication that controls it.
A licensed clinician's signature and credentials
The letter is medical evidence only when a licensed clinician — opining within their specialty — reviews it, exercises independent judgment, and signs it with their credentials. VA Claim Commander drafts the letter from your records and your story; your clinician signs it. An unsigned draft is a draft.
Filing Hypertension as a secondary condition
Under 38 C.F.R. § 3.310, if a service-connected condition caused or aggravated Hypertension, it is service-connected too. The nexus letter’s job becomes explaining the medical mechanism. The pathways veterans most commonly file:
Hypertension secondary to PTSD / Mental Health
PTSD dysregulates the autonomic nervous system and elevates cortisol, causing sustained increases in blood pressure over time.
What proves it: Blood pressure readings across multiple visits; cardiology or primary care nexus letter connecting chronic stress response to hypertension diagnosis.
Full guide: Hypertension secondary to PTSD / Mental HealthHypertension secondary to Sleep Apnea
Repeated oxygen desaturation events during apnea episodes activate the sympathetic nervous system nightly, producing sustained daytime hypertension.
What proves it: Blood pressure records; cardiologist or primary care nexus letter noting the well-established causal relationship between untreated sleep apnea and hypertension.
Full guide: Hypertension secondary to Sleep ApneaHypertension secondary to Diabetes Mellitus (Type 2)
Insulin resistance and diabetic kidney disease both raise systemic vascular resistance and activate the renin-angiotensin system, directly causing hypertension.
What proves it: Blood pressure records across multiple visits; endocrinologist or primary care nexus noting the metabolic link between insulin resistance and hypertension.
Full guide: Hypertension secondary to Diabetes Mellitus (Type 2)Hypertension secondary to Major Depressive Disorder / Depression
Chronic depression activates the sympathetic nervous system and hypothalamic-pituitary-adrenal axis, producing sustained cortisol elevation that raises blood pressure.
What proves it: Blood pressure records; primary care or psychiatrist nexus letter linking HPA axis dysregulation from depression to hypertensive changes.
Full guide: Hypertension secondary to Major Depressive Disorder / DepressionHypertension secondary to Anxiety Disorder
Chronic anxiety maintains the sympathetic nervous system in a state of sustained activation, continuously elevating cardiac output and vascular resistance to cause hypertension.
What proves it: Blood pressure records; cardiologist or psychiatrist nexus letter documenting sympathetic overdrive as the mechanism linking anxiety to hypertension.
Full guide: Hypertension secondary to Anxiety DisorderWhy nexus letters fail
- Conclusory: an opinion with no rationale. The rater is told to weigh reasoning, and a bare “it’s related” weighs nothing.
- Wrong standard: “may be related” or “possibly caused by” instead of “at least as likely as not.”
- Ignores the other causes: a strong letter names the recognized non-service risk factors and explains why they don’t displace the service connection.
- Outside the specialty: a clinician opining far from their field gets less weight than one whose practice covers the condition.
- Unsigned: a draft nobody signed is not medical evidence — it is homework.
Read a complete nexus letter — free, no account
4,348 words, 11 verified studies, the § 3.310 secondary framework — published in full so you can see the standard before you write a word.
Drafts are prepared for review and signature by a licensed clinician. Documentation quality is the promise — never a claim outcome.
Common questions
Do I need a nexus letter for a Hypertension VA claim?
If service connection isn't already established for Hypertension, a medical nexus opinion is usually the piece a rater weighs most heavily. It connects the diagnosis (7101) to your service — or to an already service-connected condition — using the "at least as likely as not" standard. Presumptive claims are the main exception.
What must a nexus letter for Hypertension say?
Four things: the current diagnosis by name and diagnostic code; the connection theory (direct under 38 C.F.R. § 3.303, or secondary under § 3.310); the opinion stated to the "at least as likely as not (50 percent or greater probability)" standard; and a medical rationale grounded in your records and the medical literature — not a bare conclusion. It must be signed by a licensed clinician.
Who has to sign a nexus letter?
A licensed medical professional — a physician, or another clinician opining within their specialty. VA Claim Commander drafts the letter from your own records and story; a licensed clinician reviews, exercises independent judgment, and signs. An unsigned draft is not medical evidence.
Can Hypertension be claimed secondary to another condition?
Yes — veterans commonly file Hypertension secondary to PTSD / Mental Health, Sleep Apnea, Diabetes Mellitus (Type 2) under 38 C.F.R. § 3.310. In a secondary claim, the nexus letter's job changes: instead of connecting Hypertension to service directly, it explains the medical mechanism by which the service-connected condition caused or aggravated it.