Symptoms of Giardia may either begin gradually or develop without warning. They generally occur one to two weeks after initial exposure to the Giardia parasite.
Although symptoms vary from person to person, common ones include:
The symptoms of chronic Giardia, a more serious form of the intestinal illness, include:
Increased gas (flatus)
Loose stools
Burping
Dehydration.
(Click Giardia Symptoms for a more detailed list of both common and chronic symptoms of Giardia, as well as an explanation of how long symptoms are expected to last.)