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Before you self-diagnose your symptoms as due to a parasite, it’s important to understand what a parasite is. “A parasite is an organism that lives on or in a host organism and gets its food from or at the expense of its host,”
according to the CDC. There are three classes of parasites: Protozoa, which are tiny, one-celled organisms that typically live in the intestines, blood, or tissue; helminths, which are parasitic worms such as tapeworms,
roundworms, and thorny-headed worms; and ectoparasites, which are ticks, fleas, lice, and mites that attach to or burrow into the skin. Parasites can cause disease and even death, but fortunately, if caught early, the infections can usually be treated with medication. (And sometimes they are just annoying and icky, but not necessarily life-threatening—like head lice.)
Here are some silent signs and parasite symptoms that could mean you are hosting one of these tiny invaders, including the parasite that millions of people in the United States have and don’t know it.
You ingested (or swam in) some questionable waterWhether you were traveling abroad and drank from the tap or went to the lake around the block and splashed around for a bit, ingesting contaminated water is one of the most common causes of parasites, according to Daliah Wachs, MD, a board-certified family physician in Las Vegas. In fact, before you drink that next glass of water, here are some things you need to know about whether or not your tap water is safe.
You enjoy a rare steak
Tend to prefer your foods on the rare side? It might not be the best option if you’re looking to avoid a parasite. “Ingesting raw or undercooked beef or pork can lead to [infection by] the Taenia type of intestinal tapeworms,” says Dana Hawkinson, MD, an assistant professor at the University of Kansas School of Medicine. “Eating certain raw fish can lead to [infection by] diphyllobothrium, [a type] of intestinal tapeworm. Additionally, ingestion of contaminated food or water can lead to an Ascaris infection.” Ascaris intestinal roundworms can grow up to 35 centimeters in length and lead to intestinal blockage, so you definitely want to avoid them.
You’re losing weight
