(VOVworld) - Hillary Clinton returned to the campaign trail on Thursday after taking three days off with pneumonia, and the Democratic presidential candidate faced a more challenging political landscape.

US Presidential election 2016: Clinton got back to campaign trail

Mrs Clinton appeared in good health on a visit to Greensboro, North Carolina, and told reporters that she had kept her diagnosis last Friday quiet, telling only senior staff, because she thought she would be able to "power through" the illness and keep campaigning. She said that from her perspective, she thought she was going to be fine and there was no reason to make a big fuss about it.  On Sunday, Clinton nearly collapsed while leaving a ceremony marking the September 11, 2001, attacks in New York.