Final answer:
Edgar Allan Poe suffered a mental breakdown shortly before his death in 1849 due to the death of his wife and his history of substance abuse.
Step-by-step explanation:
Edgar Allan Poe suffered a mental breakdown shortly before his death in 1849 due to a combination of factors. One major factor was the death of his wife, Virginia Clemm, from tuberculosis. This loss had a profound impact on Poe's mental and emotional well-being, as he was deeply devastated by her passing. Additionally, Poe had a history of substance abuse, including alcohol, which likely contributed to his mental instability.
It is important to note that while Poe did suffer from mental health issues, there is no evidence to suggest that he had a terminal illness. Speculation regarding his cause of death has varied, but it is generally believed that he died from complications related to alcoholism.
Learn more about Edgar Allan Poe's mental breakdown and its causes