Symptoms of intestinal parasites in humans

Updated November 21, 2016

There are two types of intestinal parasites, helminths and protozoa. Helminths are we what we know to be as tapeworms, pinworms, and roundworms. Protozoa are the giardia and cryptosporidium. People can live with parasites for many years without showing any symptoms, but once they do appear, they can be severe.

Common Symptoms

The most noticeable symptoms of intestinal parasites are diarrhoea, nausea, and perianal (itching of the outer anal area) itching.

Minor Symptoms

Some people may experience symptoms such as a runny nose, restlessness, or blisters upon the mouth. Others have experienced allergy type symptoms (sneezing, itching), headaches, increased appetite, and extreme fatigue.

Other Symptoms

Other symptoms may include joint pain, chronic fatigue, and auto immune deficiencies (such as continually getting sick).

Serious Symptoms

If the parasites go untreated, a person can experience bad smelling stools, diarrhoea, flu-like symptoms, loss of appetite, abdominal cramps and gas, mucous and blood in their stools, rashes and itching, and even passing worms in the stool.


Intestinal parasites can cause intestinal obstructions and block necessary nutrients. People can also suffer with mental capacity and suffer intestinal bleeding.


If you suspect that you have an intestinal parasite, it is important to seek medical attention to properly diagnosis which parasite is inhabiting your intestine for proper treatment.

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