A BRAVE Hampshire mum will conquer her fear of heights for her poorly little boy.

Little Sebbie Smith from Colden Common was diagnosed rare illness making him just one in a million with the life-threatening condition.

Before his first birthday, the youngster suddenly became ill, losing two kilos in two months and gaining an insatiable thirst, drinking up to four-litres a day while spots covered his skin and one of his eyes was forced closed by a tumour.

Since his diagnosis of the cancer-like Langerhan's Cell Histiocytosis (LCH) in May 2015, at two-and-a-half-years-old the youngster has undergone a programme of gruelling chemotherapy, undergoing up to one session of treatment a week which he will continue under the watch of Southampton General Hospital's Piam Brown Unit and the Northbrook Ward at the Royal Hampshire County Hospital in Winchester until November this year.

Sebbie, pictured below, now three-and-a-half, will also have to take tablets three times a day for the rest of his life to prevent Diabetes Insipidus after the disease damaged his pituitary gland.

Hampshire Chronicle:

Now his mum Kristina is preparing to abseil down a Hampshire landmark on Thursday to help others with the disease - despite her fear of heights.

The mum-of-two will make her way down the outside of the 170-metre tall Spinnaker Tower to raise cash for HistioUK which funds research into LCH and provides information and support for affected families.

She will be joined by five mums from Sebbie's preschool, Rainbows Playgroup in Colden Common who will raise cash for the service.

Kristina, 40, from Colden Common, who works for the environment agency said: "My child happens to be that one in a million. He is incredibly brave. He still doesn't know he's ill. He gets frustrated that he can't go to soft play or playgroup, go for a swim or dig for mud in the garden, but his immunity is low and his central line has to be protected.

"As a parent, it feels impossible to know what to do to help your child in such a horrible situation.

"There is a high chance of it recurring until well into his teens, when hopefully it will 'burn out' for good. For about 20 per cent of children with this condition, the outcome is fatal.

"The one thing we feel we can do is help raise funds and awareness for the research that is needed into why young children get LCH in the first place, and what more can be done to prevent it.

"This is no mean feat as I am terrified of heights, but I want to reflect the courage that our little man has every day."

Kristina has already raised nearly £3,000 towards her £5,000 target.

And Sebbie's gran Jean Wood from Titchfield is also preparing to hold a bumper charity music festival on June 5 at Portsmouth's Square Tower to raise even more cash for the cause.

For more information about the music festival or to book tickets visit wegottickets.com/event/351071.

To help Kristina with her fundraising visit justgiving.com/supersebbie.

To support Rainbows Playgroup visit justgiving.com/rainbow-playgroup