Which symptoms are most commonly associated with giardiasis?

Giardiasis, caused by the Giardia lamblia parasite, is characterized by gastrointestinal symptoms that primarily involve the intestines. The most commonly associated symptoms include watery diarrhea and foul-smelling flatulence due to the malabsorption of nutrients in the intestine. This occurs because the parasite interferes with the absorption process, leading to diarrhea that is often described as greasy or foul-smelling.

The presence of flatulence is also notable because the unabsorbed contents result in more gas production. Patients might not experience fever or severe abdominal cramps commonly seen with other gastrointestinal conditions, which distinguishes giardiasis from other potential infections that cause bloody diarrhea or intense cramping. The hallmark features of giardiasis align closely with the symptoms of watery diarrhea and foul-smelling flatulence, making this the correct choice.