King Harald's deteriorating condition is being monitored closely, and his beloved family are gathered by his side. The monarch is just days away from celebrating his 58th wedding anniversary with wife Queen Sonja of Norway, which takes place on Saturday.
In 1968, the couple said 'I do' in Oslo Cathedral. The couple had dated for nine years but there was controversy over their romance, as Sonja was a commoner.
In a break from royal tradition, Sonja wore a silk wedding gown by Norwegian department store, Molstad and wore flowers in her hair instead of a tiara to secure her veil.
Harald told his father Olav that if he was not allowed to marry Sonja he would not marry at all. This would have been a disaster as it would have ended the reign of his family and the Norwegian monarchy, as Harald was the sole heir to the throne.
It is not just King Harald who has health struggles in recent months, other members of the Norwegian royal family have also been suffering. Harald's sister, Princess Astrid of Norway, 94, was rushed to hospital in May and ended up undergoing heart surgery. Before that, she also had a bout of pneumonia. In latest updates, she is said to be active again following the surgery.
Meanwhile, Harald's daughter-in-law Crown Princess Mette-Marit of Norway underwent a successful lung transplant at Oslo University Hospital Rikshospitalet in June. Diagnosed with chronic pulmonary fibrosis in 2018, her condition progressed last year and she was pictured using an oxygen tube on more than one occasion before her transplant.
Following the surgery, Are Holm, Head of the Department of Respiratory Medicine at Oslo University Hospital Rikshospitalet, said: "The Crown Princess's condition is as good as can be expected under the circumstances."
In addition, Durek Verrett, who married Princess Martha Louise of Norway, has recently undergone a successful kidney transplant a year after revealing he required dialysis several times a week "just to stay alive". This took place at the same hospital where King Harald is admitted.
King Harald, 89, was hospitalised with haemolytic anaemia which can be a mild condition but can also turn into a life-threatening medical emergency. What is haemolytic anaemia?
Haemolytic anaemia causes the number of red blood cells in the body to be reduced, leading to fatigue and shortness of breath.
The sole cause is not always obvious, but it can be caused by infections, other autoimmune conditions or certain drugs.
Symptoms may include breathlessness, feeling tired, heart palpitations or chest pain.
Those who have had the disease for a while may start to develop physical symptoms such as yellowish skin.
Treatment plans usually involve immunosuppressant drugs such as steroids.
The monarch's condition is said to be "extremely serious" at present, with his family gathered around him.
