Do you ever feel, during your PhD, that you are not “productive enough”? Guess what, you are not alone. In this post, I share the three most frequently-appearing productivity problems voiced in doctoral workshops we have run in Estonia and Spain. I hope this shows PhD students that they are not alone… and gives PhD supervisors hints about the hurdles their students often face (whether they mention them explicitly or not). Also, I will give a couple of simple rules to know if these are a problem for you particularly.