Why does charlie have trouble with his speech after his intelligence increases?

After Charlie's intelligence increases, he experiences difficulty with his speech because he becomes more aware of complex language and the nuances of communication, which he struggles to articulate effectively. His rapid intellectual growth leads to frustration as he grApples with expressing his newfound thoughts and ideas. Additionally, the disconnection between his advanced cognition and his previously limited vocabulary creates challenges in verbal expression. This contrast highlights the emotional and psychological impacts of his transformation.