Navratilova was assisted down the mountain by porters and driven to the nearby Kilimanjaro Christian Medical Centre for assessment.
She was in good spirits as she left the campsite at Horombo, but disappointed to have to leave the mountain.
Navratilova, who was leading a team of 27 climbers to raise funds for the Laureus Sport for Good Foundation charity, had reached 4 500m during the day, the highest point of the climb so far.
The Laureus team have had to face unseasonal weather of blizzards and mists over the last few days.
The climb began on Monday, December 6 and is due to reach the summit on Saturday, December 11.
The rest of the team are continuing with the climb.
Source: news24
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