Function: the_content() isn’t working in my theme

The function the_content() isn’t working in my theme. I’ve inserted the_title() in the same pages (page.php and index.php) and this successfully prints the title, so the pages are being queried at least somewhat properly. Any reason why this could be? I’ve tried including the “Read more” type argument that I found in the source of other themes, but this didn’t fix the problem.