If you filed for sleep apnea as directly connected to service and got denied, you're not alone. Direct service connection for obstructive sleep apnea is one of the hardest claims to win.
The reason is simple. The VA looks at your denial and sees three civilian risk factors: you're male, you've gained weight since service, and you're older now. Their C&P examiner writes that those factors outweigh anything from your time in uniform, and that's usually enough to deny.
Most veterans who win sleep apnea claims win them secondary to an already service-connected condition. The two strongest pathways are through mental health conditions and through rhinitis or sinusitis.
For PTSD, depression, or anxiety: medications like SSRIs and atypical antipsychotics are well documented to cause weight gain. If you can show that your weight increased after starting those medications, and that the weight gain contributed to your OSA, that's a solid causal chain. The medical literature supports it clearly.
For rhinitis or sinusitis: chronic nasal obstruction contributes directly to upper airway collapse during sleep. If you're already service-connected for either, the secondary connection to OSA is well established.
One tip worth knowing: look up the STOP-BANG screening criteria for sleep apnea. It's a validated clinical tool that scores your risk. If you can show you met several of those criteria while still in service (snoring, tiredness, observed apneas, high blood pressure, BMI, age, neck circumference, male gender), it helps build the argument that your OSA was developing during your time in uniform even if it wasn't formally diagnosed until later.
If your direct claim was denied, don't give up. Look at what conditions you already have service-connected and ask whether there's a secondary path.
$50 record review fee at intake. $350 only if we can support your claim.