But her absence has triggered weeks of online rumors and conspiracy theories about her health.
Social media speculation spiked after she posted an edited photo with her children on Mother’s Day earlier this month, leading news agencies including Reuters and the Associated Press to issue kill notifications.
Catherine, 42, has not appeared in public since Christmas Day.
The announcement comes at a difficult time for the royal family, with King Charles temporarily stepping back from public duties while he is treated for cancer.
Buckingham Palace has not said what type of cancer the 75-year-old has, but confirmed that it was not prostate cancer.
‘I am well’
In her statement, Kate said she had “taken time” to explain the situation to her three children — George, Charlotte and Louis — and that she had told them: “I am well and getting stronger every day by focusing on the things that will help me heal; in my mind, body and spirits.”
