Though his first thought was that it could be a side effect of the illness and his second thought was about going to investigate the cave, in both instances he stopped himself from voicing those opinions. That feeling within him twisted at the thought of providing indifferent and impersonal ideas like it was a regular case.
 
Instead, he reacted with concern for her safety. "I'm glad you feel okay. I was worried." Considering the state he had found her in it that seemed reasonable to be concerned.