Bloodletting was not effective and could be harmful due to several reasons. Modern scientific understanding has shown that the theory of humors and the practice of bloodletting were based on flawed premises. Here are some key points:

Lack of scientific evidence: The belief in humors and the effectiveness of bloodletting were not supported by rigorous scientific evidence. It was a speculative theory that lacked empirical validation.

Misunderstanding of human physiology: The theory of humors did not accurately reflect the complexity of human physiology and the true causes of diseases. It oversimplified the understanding of health and illness.

Loss of vital fluids: Bloodletting resulted in the loss of significant amounts of blood, which could lead to severe anemia and weaken the body's ability to recover from illness.

Infection and other complications: The use of unsterilized tools and improper techniques during bloodletting carried the risk of infection. Additionally, excessive bleeding could cause complications such as shock, fainting, or even death.

Ignoring underlying causes: Bloodletting focused on treating symptoms rather than addressing the underlying causes of diseases. It failed to target specific pathogens, inflammation, or other factors responsible for illness.

Modern medicine has debunked the humoral theory and replaced it with evidence-based practices. Bloodletting is now recognized as an ineffective and potentially harmful practice, and its use has been abandoned in contemporary medical treatments.
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