Part of my complaint about the pink and fluffy message about breast cancer relates to this. I know I look healthy. I don't look like a cancer patient. Thank goodness for that since actually looking like a cancer patient isn't a good thing. When you walk into a chemo room, you will see a room full of people who look pretty "normal". The caps might be the only clue.
Cancer is not a one and done event. It isn't like an infection or something where you get treatment and move on. While many do get treatment and move on, cancer leaves its impact in many ways.
Accepting treatment and following medical advice isn't "positive" or "brave", etc. It's the best option in most cases. I mean, really, what is the alternative?