Physical Nexus Letters
Nexus letters for the physical conditions veterans actually claim
From migraines and sleep apnea to GERD and IBS, Dr. Allen writes physician-authored nexus letters that map your condition to your service record.
Headaches & Migraines
Migraine, tension, and post-traumatic headache — including secondary to TBI.
Learn more →Sleep Apnea
Direct sleep apnea and secondary sleep apnea (PTSD, GERD, obesity, medication-induced).
Learn more →GERD
GERD directly or secondary to mental health medications and other service-connected conditions.
Learn more →View All
Every physical and secondary condition we write nexus letters for.
Learn more →FAQ
Frequently Asked Questions
Do I need to be diagnosed already?
Almost always yes. Nexus letters connect a diagnosed condition to service — they don't replace the diagnosis itself.
What if my condition started years after service?
That's common and often provable. Late-onset presentations of sleep apnea, migraines, and GERD are frequently service-connected through a well-reasoned nexus letter.
Do you write secondary nexus letters?
Yes. Many physical claims are strongest as secondary claims (e.g., sleep apnea secondary to PTSD, GERD secondary to psychiatric medications). Dr. Allen writes both direct and secondary letters.