<p>I disagree with some others, senior year first semester grades are vitally important and can kill your app. However, on the mid year report your counselor has a space for comments and can mention your illness affecting your grades. I suggest you do this, I had my counselor mention the fact that I couldn’t take Calculus BC because of a scheduling conflict so at worst it can’t hurt you. </p>
<p>What you do not want to happen is that you get rejected and then you wonder if it was because of some stupid illness.</p>