British singer Amy Winehouse continues to undergo tests at a London hospital. The singer was hospitalized earlier in the week after she fainted while signing autographs.

Spokesman Chris Goodman said Winehouse had more scans and tests on Thursday. After fainting on Monday, doctors want to get to the bottom of what is wrong with the 24-year-old singer. An assistant did catch Winehouse before she hit the ground when she fainted.

Winehouse is scheduled to sing at a June 27th concert to celebrate Nelson Mandela's 90th birthday. She will then take part in the Glastonbury music festival the next day.

Her spokesman says that although Winehouse still plans to perform at both concerts, the decision "will be made entirely on the advice of her doctors and in her best interests."

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