Frightening Parasites that Live in the Human Body

Talking about parasites that live in the human body is almost offensive, just like talking about feces. But it is important to be aware of the possible complications that can result from it and how to prevent parasites from thriving in the first place.

Giardia lamblia

This protozoan parasite can cause giardiasis if it gets into the small intestine. There is a specific treatment for treating this infection, but most people mistake the condition for something else. Watch out for the following symptoms: chronic fatigue, weight loss, frequent weakness, stomach pain, stomach cramps, and chronic diarrhea.


Infections are common in areas where sanitation is poor. The name of the worm, which is a type of roundworm, most likely came from the size of the adult hookworm’s head which is about 1 cm. When the person has a lot of worms in the intestine, it can lead to anemia, diarrhea or constipation, and fever. In severe cases, it can even lead to stunted growth and poor development in children.


Also called threadworm, the pinworm lives in the colon and rectum and usually manifests with a very itchy behind. Threadworms can be passed from person to person through poor sanitation and hygiene. Scratching the anus can also lead to infected sores and broken skin. Unwashed hands can transport the eggs to other objects you touch.


These flat worms thrive in the intestines and can be transported through contaminated water and food. There are six types of tapeworms known to affect humans and they are usually differentiated based on the animal source. Make sure to cook your food properly to avoid this.


These are nematodes that are common in tropical countries like Singapore. The name applies to a group of parasites also included in this list which can be acquired through contact with contaminated feces and live in the intestine. Poor sanitation is usually the cause of infections. Moreover, there is a type of roundworm, Strongyloides stercoralis that causes life-threatening complications.


This is a type of roundworm that does not usually cause any symptoms. But severe cases can lead to weight loss, diarrhea, bloody stools, and stomach pains. Most of the worms are transmitted through contact with contaminated food and soil.


A female mite will burrow into the skin and lay eggs. This results in very itchy skin called scabies infection. If the skin breaks from too much scratching, it can also lead to other infections. Most people with scabies are treated with medication lotion.

Head Lice

The lice multiply very fast and suck up the blood from the scalp. This causes itching and irritation. The females also lay eggs on the hair strands which are quite visible when there are a lot of them. Specially-medicated shampoos are needed to treat head lice, but this can take a while. Head lice are different from the lice which are found on the pubic hair.