Does Having A Category Page Causes Duplicate Content Issues As It Is Displaying Full Text?

By April

YouTube video

During the 90th episode of Semantic Mastery's weekly Hump Day Hangouts, one participant asked about having duplicate content issues when displaying category page.

The exact question was:

Hi guys, hope your well, got a quick question for you.

I have a site and I'm using a free theme so not much customization there but I'm not too bothered about this but for my blog I have it on a category page, so I can have blog/post-name, my question is, will this cause duplicate content issues, as it is displaying full text on the category page? Do I need to find a way to no index the blog category page or should I just leave it alone? Many Thanks

This Stuff Works