Looking at the art makes me worry about the artist's hand. I hope they take breaks.

I've got 0 sense of what goes into making the art so what do you mean? Is this type of art more difficult ?

No like, artists are constantly using their wrists. This develops carpal tunnel syndrome which effects the nerves of your hands and makes it hard for you to do intricate things, such as drawing and even writing. From what I've seen, most of the manga artists become very sick in the manga making process. And if you keep pushing yourself despite that, it could become fatal.