There is no definitive evidence to suggest that Franz Kafka, the renowned author, was diagnosed with bipolar disorder during his lifetime. Kafka's mental health is a subject of much speculation and interpretation, but there is no concrete historical record of him being diagnosed with bipolar disorder.
Kafka did struggle with various psychological issues, including anxiety, depression, and feelings of alienation, which are evident in his personal writings and correspondence. His literary works often reflect themes of isolation, absurdity, and the human condition, which have led some scholars and readers to speculate about his mental state.
It's essential to approach historical figures' mental health diagnoses with caution, as retrospective diagnoses can be challenging and may not accurately capture the complexity of an individual's experiences. Without proper medical documentation and professional evaluation during Kafka's lifetime, it is not appropriate to assign a specific mental health diagnosis to him posthumously.
In any case, Kafka's literary legacy continues to have a profound impact on literature and our understanding of the human psyche, regardless of whether he had a specific mental health condition.