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A secondary condition branches off an island you already reached. Your service-connected condition caused a new one, and that new one is claimable too.
A secondary claim links a new condition to one you are already rated for. Common examples: PTSD leading to sleep apnea, a back injury leading to knee problems, PTSD leading to hypertension.
This is the key. You need a medical opinion stating the secondary condition is at least as likely as not caused or aggravated by your service-connected condition.
On the claim form, mark the new condition as secondary to your existing service-connected condition, and attach the nexus opinion.
Every veteran feels adrift in this process at some point. A free accredited VSO is your harbor pilot: they have sailed these waters a thousand times and will chart the whole course with you, at no cost. Never pay a fee or a percentage of your back pay for claim help.
This is general education, not legal advice or a promise of any outcome. Report your symptoms and history accurately and completely, and never exaggerate. A free accredited VSO can file any of these for you at no cost.