Hyperemisis Gravidarum- Duchess of Cambridge is expecting her second baby in April and like her first pregnancy, Kate Middleton is still suffering from Hyperemisis Gravidarum.

The acute morning sickness affecting only 1 to 2 percent of pregnant women in developed countries has affected the Duchess too. Throughout her pregnancy she has been treated in Kensington Palace. The Royal Household told in a statement on Monday, the Duchess' condition is now steadily improving.

In December 2012 during her first pregnancy, the Duchess was admitted in hospital due to Hyperemisis Gravidarum. It is a rare state considered as debilitating and prospectively life-threatening pregnancy condition associated with malnutrition, rapid weight loss, electrolyte disturbance and dehydration. Women suffer from remorseless vomiting and nausea.

Inspite of her condition, the Duchess has remained committed to her royal duties. The Duchess has several commitments this week including welcoming Singapore President Tony Tan on his four-day state visit and attending the award ceremony of Wildlife Photographer 2014. However due to her condition that has been afflicting her from time-to-time, she has to cancel other upcoming appearances.

Recently, the Duchess cancelled a supposed visit to Olympic sailor Sir Ben Ainslie's America's Cup team base due to her pregnancy sickness. "Her Royal Highness continues to suffer from the effects of hyperemesis gravidarum," the Royal Palace told in a statement during the time. "The decision not to visit was taken by the Duke and Duchess on the advice of the Duchess' doctors."

Hyperemisis Gravidarum has also cancelled the Duchess' first solo royal tour to Malta. The severe pregnancy condition starts between four to seven weeks which can leave a woman depressed and exhausted. Personal relationship may be affected, while woman may feel reserved and isolated. The pregnancy condition is a serious thing. Love, support and care of people around the patient are very important.

The second baby is the fourth in line to the throne, following Prince George, the first son of the royal couple.