A person can have parasites for a few weeks to several years, depending on the type; some, like Giardia or Crypto, might clear up in weeks (but can linger), while others, such as liver flukes or certain tapeworms, can live for years, even decades, if untreated, causing long-term issues. Most parasitic infections are treatable with medication, but some can cause chronic symptoms or complications, especially in people with weakened immune systems.
You know you might have parasites through digestive issues (diarrhea, bloating, pain), fatigue, unexplained weight loss, skin problems (rashes, itchiness), sleep disturbances (insomnia, teeth grinding), increased appetite, muscle aches, or even seeing worms or eggs in your stool; however, many infections have few or no symptoms, so a doctor's diagnosis via stool sample, blood tests, or other imaging is needed for confirmation.
Digestive Problems
Unexplained constipation, diarrhea, gas, bloating, heartburn, or nausea can be a sign of parasitic infection.
Parasitic infections often cause intestinal illness, with symptoms like diarrhea and vomiting. But they can also give you itchy skin rashes or infect other parts of your body, like your brain or lungs.
Some infections clear on their own, but most people need prescription antiparasitic drugs to get rid of intestinal parasites. These drugs work by paralyzing parasites, stopping their growth, or killing the parasite or its eggs.
You may have a parasite and no symptoms, or the symptoms may appear a long time after infection. You may also not have any symptoms and accidentally pass a parasite to another person who develops symptoms.
Symptoms usually begin 1 to 2 weeks after becoming infected with Giardia and last for 2 to 6 weeks. Occasionally, people have long-term symptoms that can last for years.
Some parasites are visually comparable to undigested foods that can appear in the stool, namely germinated bean sprouts; physicians should not only be mindful of such similarities, but should also take a full dietary history and consider any such correlations before requesting microbiologic analysis.
Ivermectin has proven to be an effective treatment for various parasitic diseases, including intestinal parasites, ectoparasites, filariasis, and onchocerciasis.
In some cases, you may begin to crave certain foods. If your parasitic organism is, for example, taking too much of your salt or sugar intake, your body will get a decreased number of salt or sugar nutrients, and you might crave more of these. The parasitic organisms need your body to survive.
H. Pylori: Signs and symptoms
Some of the most common signs of a parasitic infection include:
Colonoscopy can be useful for the diagnosis of parasitic infections, even if patients are asymptomatic.
You'll usually take mebendazole as a single dose to treat threadworms, but you might need to take it for around 3 days for some other types of worm infection. It starts to work straight away but it may take several days to kill all the worms.
Blood smear This test is used to look for parasites that are found in the blood. By looking at a blood smear under a microscope, parasitic diseases such as filariasis, malaria, or babesiosis, can be diagnosed. This test is done by placing a drop of blood on a microscope slide.
2. Digestive Problems. Persistent bloating, diarrhea, constipation, or unexplained abdominal pain may indicate a parasite disrupting the digestive system. Symptoms often linger or fluctuate, unlike typical food poisoning.
Chagas disease is often called a silent killer because many people don't realize they have it until complications from the infection kill them.
Fiber strings look like undigested food in your poop. These fiber strings are often white in appearance and can look similar to threads. For example, if you eat a lot of bananas, you may notice stringy black lines in your poop. These are from the center of the banana.
There are many at-home tests for parasites. Testing for parasites at home is very easy. Our Ultimate and Advanced Gut Health Tests both test for parasites.
Roundworms (Ascaris species) are round and long, and the length can reach 20 cm. They have pointed ends and are light brown or pink in colour. The larvae and adult worms live in the human small intestine and their eggs are passed out with stool.
Knowing if you have parasites involves recognizing symptoms like digestive issues (diarrhea, bloating, pain), unexplained weight loss, fatigue, skin rashes, or muscle aches, but often infections are subtle or asymptomatic, so a doctor's diagnosis through stool samples or blood tests is crucial for confirmation, especially if you have persistent symptoms like fever, extreme fatigue, or blood in your stool.
However, if all of that seems reassuring, you should know that in a few cases a dead parasite can actually be more trouble than a live one. Take tapeworm infections. They're generally limited to one or two symptomless adult tapeworms, which can live in the intestine for up to 30 years.
Chronic parasite infection can alter the commensal flora of the gut, resulting in reduced airway inflammation/allergy and inflammatory bowel disease.
What are the most common food sources of parasites?