James Van Der Beek was sure that he was on top of his health — but then he was diagnosed with stage three colon cancer. After revealing his diagnosis earlier this week, the actor has shared additional details about his medical journey in hopes of raising awareness about colorectal cancer.

James Van Der Beek, who shared his diagnosis of stage three colon cancer last week said he was “shocked” to learn of his condition, finding it the trickiest thing he ever faced. The Dawson’s Creek star said he began his treatment for this cancer – which spreads aggressively.