Singapore's Prime Minister Lee Hsien Loong talks with government officials during the Plenary session at the 27th Association of Southeast Asian Nations (ASEAN) summit in Kuala Lumpur, Malaysia, November 21, 2015. [Photo/Agencies]

SINGAPORE -- Singapore's Prime Minister Lee Hsien Loong's tests at Singapore General Hospital (SGH) "were all normal," said Foreign Minister Vivian Balakrishnan in his Facebook on Monday, recounting what happened at the National Day Rally on Sunday.

Vivian Balakrishnan wrote "we then went to SGH for more tests, which were all normal before calling it a night around 1:30 a.m."

PM Lee took ill during the English portion of his speech at National Day Rally on Sunday. The Prime Minister's Office said PM Lee was feeling unsteady because of prolonged standing, heat and dehydration. His heart is fine and he did not have a stroke.

After taking about an hour's rest, PM Lee resumed the rally, speaking for about 15 minutes. Then, PM Lee went to SGH for a check-up.

In his Facebook update, the foreign minister also called on Singaporeans continuing to do their best. "Let us all count our blessings, and continue to do our best. There is still so much more to be done," the minister added.