The Royal couple, Princess Kate and Prince William, are expecting their third child. Unfortunately, the Duchess Of Cambridge is suffering from an illness called hyperemesis gravidarum, which she previously experienced during her first two pregnancies.

According to ABC News, scheduled engagements were canceled to prioritize the health of Princess Kate. Meanwhile, the Kensington Palace also released an official statement about her pregnancy.

Princess Kate’s Pregnancy History

It can be recalled that the Duchess of Cambridge was hospitalized in December 2012.

This was due to her hyperemesis gravidarum condition during Prince George’s time. She was admitted to King Edward VII Hospital for the treatment. The Royal couple’s first child is now four-year-old.

The Duchess’ second pregnancy with Princess Charlotte was in September 2014. She is now a two-year-old child and once again, Kate Middleton missed a scheduled engagement with Prince William in Oxford to be treated. And with the third pregnancy, she is currently being treated at Kensington Palace.

When asked about the Duchess, Prince Harry said, "I haven't seen her for a while, but I think she's OK." Before this news, Kate was on a Royal tour for five days in Poland and Germany, which she attended with the Prince and children back in July.

Last week, she was also seen in public with her husband and brother-in-law to pay tribute to their late mother Princess Diana.

What is Hyperemesis Gravidarum?

As per the earlier source, hyperemesis gravidarum is a pregnancy complication characterized by extreme vomiting and persistent nausea. National Institutes of Health added that this condition may lead to weight loss and dehydration.

Dr. Jennifer Ashton categorized the condition as extremely serious. As ABC News' chief women health correspondent and practicing OB-GYN, she believes that describing the condition as severe morning sickness is inaccurate. A lot of factors can be affected by this condition: chances are electrolyte and potassium abnormalities, severe malnutrition, sodium, and organ failure.

Moreover, vomiting and nausea are reportedly caused by chorionic gonadotropin. It is the rapidly rising hormones’ blood level. As most cases do, we are looking at vomiting every hour. This experience does not until the end of the first trimester. As for the treatment, it depends on the severity of symptoms and how fast her recovery will be.

Treatment includes IV hydration, complimentary diets, and certain diets and of course, more rest. Kensington Palace did not announce yet how long Princess Kate had been pregnant.