Several symptoms can indicate writer's block. Here are just a few:
Difficulty beginning or completing a project
Inability to concentrate or focus on what you're writing
Lack of inspiration
Physical symptoms such as feelings of fatigue or depression, headaches, and restlessness
Difficulty coming up with ideas
Difficulty organizing your thoughts
While the experience is unique for every writer, it is noteworthy that writer's block is not a pathology, and you can overcome it.