You’re spending a lot of time in the bathroom
Giardia infection is the most common intestinal parasitic disease affecting humans in the United States—you might get it from drinking giardia-infested water, eating raw food that contains the parasite, touching surfaces contaminated with giardia (like bathroom handles or diaper pails), or swimming in giardia-infested lakes, rivers, or streams.
The infection is known for causing watery diarrhea, gas, abdominal cramps, and dehydration within one to three weeks after exposure.