Final answer:
The most appropriate response is that hypertension can cause damage without any noticeable symptoms, so it's crucial to manage blood pressure even if the person feels well.
Step-by-step explanation:
The most appropriate response to a client diagnosed with essential hypertension who feels great and is unconcerned about their high blood pressure would be: "Damage can be occurring to your heart and kidneys even if you feel great." This is because hypertension is often asymptomatic, meaning it doesn't typically cause obvious symptoms, but it can still lead to serious health complications such as heart attacks, strokes, aneurysms, peripheral arterial disease, chronic kidney disease, and heart failure. It's important to manage hypertension with medication and lifestyle changes to prevent these complications.