The New Zealand swimmer Hayley Palmer has been forced to withdraw from the FINA World Championships starting on Sunday.
The 22-year-old suffered swollen glands at the team's final training camp in Hong Kong and after the complaint worsened further medical treatment was sought when they arrived in Shanghai on Wednesday.
After a series of medical tests and consultation with Swimming New Zealand medical staff in Auckland, it was decided to admit Palmer to hospital in Shanghai.
She has been withdrawn from the championships and will return to New Zealand as soon as she is able for further treatment.
Swimming New Zealand team leader Mark O'Connor said the US-based swimmer is devastated and disappointed with the championships providing a key stepping stone to next year's London Olympics.
It is a blow for the Delhi Commonwealth Games medallist who moved to Florida this year to train under renowned sprint coach Randy Reese to further her bid for Olympic success.
Swimming New Zealand Performance Coach Mark Regan is also undergoing hospital treatment for a possible kidney stone ailment but is expected to back in action latter today.
The pool competition gets underway on Sunday.