Health concerns and death
McGuinness was a member of the Pioneer Total Abstinence Association, which meant that he did not drink alcohol.
In December 2016, McGuinness was advised against making a planned visit to China on medical grounds, initially announcing that this was due to "unforeseen personal circumstances". After subsequent tests, he was told that he was suffering from "a very serious illness". McGuinness and Sinn Féin declined to give details of his illness to the media. In January 2017, The Irish Times disclosed that McGuinness was suffering from amyloidosis, a rare incurable disease that affects organs. McGuinness complained that the Times had breached his privacy.
On 6 March 2017 McGuinness was hospitalised at Derry's Altnagelvin Area Hospital due to ill health. He died on 21 March, at the age of 66.