As cited by South African media, the Zulu Royal House stated that King Misuzulu kaZwelithini is feeling good and only underwent minor tests following the sudden death of his councellor, Douglas Xaba.
Earlier on Sunday, traditional Zulu Prime Minister Mangosuthu Buthelezi relesed a statement, saying that the 48-year-old monarch is at present receiving treatment in Eswatini after falling ill earlier in the day.
Buthelezi said that there are fears that the king's senior Induna (traditional counselor), Mr Xaba, who recently died, was poisoned. After Xaba's death, the king also felt sick, suspecting that he also could have been poisoned.
Buthelezi said that he was told of the monarch's health by his brother, Prince Vumile.
"It is understood that His Majesty is under medical care and further information will be conveyed when it comes available," Buthelezi said, adding that the authorities will investigate the case if necessary.
He explained that the king preferred to seek treatment in Eswatini, the last absolute monarchy in Africa, because he felt uncomfortable being hospitalized in South Africa, where his mother "received treatment and subsequently died",
According to several police sources in Eswatini, the monarch is being treated at the Ezulwini private hospital, a few kilometers from the royal residence of Ludzidzini.
In South Africa, sovereigns and traditional chiefs are recognized by the constitution. Although they have no executive power, they wield deep moral authority and are revered by their people.
Misuzulu was crowned last year at a historic event attended by thousands at the Moses Mabhida Stadium in South Africa's coastal city of Durban in the province of KwaZulu-Natal. He ascended to the throne once held by his late father, Goodwill Zwelithini, who died in March 2021, after more than 50 years in power.