8 Signs You're Infected With a Parasite

You’re spending a lot of time in the bathroom

This is also one of the more common parasite symptoms noticed by hosts. According to the CDC, Giardia infection is one of 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.