Pete Loeffler, the lead singer of Chevelle, stated in an interview regarding the song and video that "The Red" is a commentary on frustration and anger in general - becoming so upset that you literally are seeing "red". The video makes this fairly clear as well; Loeffler is a speaker at an anger management seminar, and is watching the anger in the attendees build up throughout the song.
Pete Loeffler, the lead singer of Chevelle, stated in an interview regarding the song and video that "The Red" is a commentary on frustration and anger in general - becoming so upset that you literally are seeing "red". The video makes this fairly clear as well; Loeffler is a speaker at an anger management seminar, and is watching the anger in the attendees build up throughout the song.