Parasites: The Dirty Details

Parasites: What You Need to Know (Without the Hype)

The idea of parasites living in the human body is unsettling—but it’s also a real part of global health. A parasite is defined as an organism that lives on or inside a host and depends on it for nourishment. While many infections are more common in certain parts of the world or under specific conditions, understanding how they work can help you make smarter health choices.

If you’re anything like most people, your first thought is probably: How do I avoid them—or get rid of them if I have one? The answer starts with understanding what parasites are, how they spread, and how they affect the body.

In this post, we’ll break down the basics. In the next one, we’ll look at evidence-based approaches to prevention and treatment.

How Do Parasites Enter the Body?

Parasites don’t just appear—they’re transmitted through specific pathways. The most common include:

1. Contaminated food or water
Undercooked food or unclean water can carry organisms like protozoa and worms.

2. Insect vectors
Bites from insects such as mosquitoes can transmit certain parasitic infections.

3. Person-to-person contact
Some parasites spread through close contact, including sexual transmission.

4. Skin or environmental exposure
Walking barefoot on contaminated soil or inhaling particles from contaminated dust can allow some parasites to enter the body.

Major Types of Parasites

Parasites come in several forms, but most fall into four broad categories:

1. Protozoa

Microscopic, single-celled organisms that can multiply inside the body—often affecting the digestive system.

2. Nematodes (Roundworms)

Larger, multicellular worms that can live in the intestines or migrate through tissues.

3. Cestodes (Tapeworms)

Flat, segmented worms that typically live in the intestines and absorb nutrients from their host.

4. Trematodes (Flukes)

Flatworms that can infect organs such as the liver, intestines, or blood vessels.

A Closer Look at Common Parasites

Here’s a simplified look at some of the more well-known parasites and how they affect the body:

Protozoa

• Amoebas – Can cause digestive issues like diarrhea and, in some cases, more severe intestinal disease.

• Giardia – Often spread through contaminated water; symptoms include bloating, diarrhea, and fatigue.

• Trichomonas – A sexually transmitted parasite that may not always cause symptoms but can lead to irritation and discharge.

• Toxoplasma gondii – Commonly associated with undercooked meat or cat litter; usually mild but can be serious in certain individuals.

Nematodes (Roundworms)

• Ascaris (roundworm) – One of the most common worldwide; may cause digestive issues and nutrient malabsorption.

• Hookworms – Enter through the skin and can lead to anemia and fatigue.

• Pinworms – Especially common in children; known for causing itching around the anal area.

Cestodes (Tapeworms)

• Beef and pork tapeworms – Typically contracted through undercooked meat; may cause mild digestive symptoms but can persist for years.

• Fish tapeworms – Linked to raw or undercooked fish; can contribute to vitamin deficiencies.

Trematodes (Flukes)

• Blood flukes – Spread through contaminated freshwater in certain regions.

• Liver flukes – Often linked to raw or undercooked fish; can affect liver function.

• Intestinal flukes – Can cause digestive discomfort and inflammation.

Ok, so that was gross… What should you do now?

If all of this made you a little uneasy—you’re not alone. But it’s important to stay grounded: many parasitic infections are preventable, diagnosable, and treatable.

Rather than guessing or self-diagnosing, the best next step is learning how to:

• Reduce your risk

• Recognize potential symptoms

• Choose safe, effective treatment options

We’ll cover all of that in the next post.

blog written by:

Jodi Jenks ND

Jodi started her journey as a holistic healer over 27 years ago when she began to see her homeopathic doctor where she learned Essential Oil Therapies and she took Reiki training from two Reiki Masters back in the mid 1990's. She expanded her education in natural health at the Naturopathic Institute of Therapies and Education and in 2017 she became a board certified Naturopathic Doctor.