Yang Zhao's death is a lot of doubt but as for the death of the hands of people do not know, but even if the record is due to illness. Yang Zhao is a relatively favored child, Sui Dynasty has just been established Zhang Zhao by his grandfather Sui Wendi's favor, so has been kept in the palace. But the inexplicable death of Yang Zhao died young is indeed a bad thing in history.
Yang Zhao was a favorite since he was a child. When Yang Zhao was only three years old, Emperor Wen of Sui put his hand on Empress Dugu's body because of his back pain, but Yang Zhao pretended not to see it to avoid the embarrassment of Emperor Wen of Sui. Therefore, Sui Wendi was very fond of Yang Zhao, who was so understanding at such a young age, so when Yang Zhao grew up a little bit, he told Yang Zhao to take a wife, but Yang Zhao cried and said he didn't want to get married for fear of being away from his grandfather, so Sui Wendi doted on Yang Zhao even more.
About Yang Zhao's death, many people speculate that it was because his eldest uncle came to become a ghost to take revenge. Because Yang Zhao has always been very healthy and careful and humble in both work and people. But because Yang Zhao's father, Yang Guang, the Emperor of Sui, killed his own brother for the sake of power, so in order to take revenge on Yang Guang, he turned into a ghost and killed Yang Zhao. Therefore, there is a saying that Yang Zhao is a "scapegoat", but this is actually because the people hated Emperor Yang's nonsense.
Historically, the cause of death of Yang Zhao is excessive obesity due to illness. That said, Yang Zhao is a very filial person, so always want to give Sui Emperor Yang pilgrimage. Because the distance is relatively far so Yang Zhao want to more on the side of Emperor Yang for a period of time, but Emperor Yang did not agree so have been requesting Emperor Yang, but because Yang Zhao is relatively fat, so the number of times to go to the death of the disease. This argument is more reasonable, after all, in ancient times, a high blood pressure will suddenly die, so the specifics are not known about Yang Zhao's death is only the then Emperor Yang know the reason.