The Maori King was admitted to hospital because of a "diabetes-related" ailment and is likely to remain there for at least another week.
King Tuheitia is understood to be still recovering in Waikato Hospital for a health-scare that sources yesterday said was a heart attack.
The King's spokesman Tukoroirangi Morgan said he became unwell on Sunday night having earlier attended Hamilton's 150th civic celebrations that day.
He was admitted to hospital in "some discomfort".
"After a thorough examination it can be confirmed that he did not suffer a heart attack," said Mr Morgan, in a media statement.