Back in Episode 11 of the Berserk anime, Casca and Guts fell from a high cliff into a river. Later, Guts found Casca suffering from high fever, so he decided to warm her body. While undressing her, he saw something (as I saw) like blood flowing down (I couldn't understand from where), then he said:
Now I understand. Must be hard, being a woman
What did Guts mean when he said that?
I don't think she was having periods, but then what else could it be specific only to a woman.