Died due to illness.

Sun Yat-sen is the pioneer of China's modern national democratic revolution, the great forerunner of China's democratic revolution, the founder of the Republic of China and the Chinese Kuomintang, the advocate of the Three People's Principles, and the founder of the "Five-Power Constitution".

On March 12, 1925 (the fourteenth year of the Republic of China), he died of liver cancer in Beijing.

On June 1, 1929, according to his last wish, he was buried in Sun Yat-sen Mausoleum in Zijin Mountain, Nanjing.

Extended information:

In 1924, Feng Yuxiang launched a coup in Beijing and invited Sun Yat-sen to go north to discuss national affairs.

Because I could not book a ferry ticket in Shanghai on December 4, I had to take a detour to Japan and take a boat from Kobe, Japan to Tianjin. After arriving, I immediately met with Zhang Zuolin and Sun. Zhang talked for 2 hours.

Sun Yat-sen was not adapted to the northern climate and felt unwell and had a fever, which was the first symptom before the onset of liver cancer. He temporarily stayed at the residence arranged by Zhang Zuolin. Zhang Zuolin invited German and Japanese doctors for consultation. His condition was slightly stable and he went to Beijing to meet him. Duan Qirui.

From then on, his condition worsened rapidly, and he was admitted to the Union Medical College Hospital on a snowy midnight. Chinese and foreign doctors and other doctors were helpless, so they performed surgery to open his liver and confirmed liver cancer. He died of illness in Beijing on March 2, 1925. Only 59 years old,

Baidu Encyclopedia - Sun Yat-sen