The two main types of intestinal parasites are helminths and protozoa. Helminths are worms with many cells. Tapeworms, pinworms, and roundworms are among the most common helminths in the United States. In their adult form, helminths cannot multiply in the human body. Protozoa have only one cell, and can multiply inside the human body, which can allow serious infections to develop. Intestinal parasites are usually transmitted when someone comes in contact with infected feces (for example, through contaminated soil, food, or water). In the U.S., the most common protozoa are giardia and cryptosporidium.
Parasites can live within the intestines for years without causing any symptoms. When they do, symptoms include the following:
- Abdominal pain
- Nausea or vomiting
- Gas or bloating
- Dysentery (loose stools containing blood and mucus)
- Rash or itching around the rectum or vulva
- Stomach pain or tenderness
- Feeling tired
- Weight loss
- Passing a worm in your stool
These things raise your risk for getting intestinal parasites:
- Living in or visiting an area known to have parasites
- International travel
- Poor sanitation (for both food and water)
- Poor hygiene
- Age -- children and the elderly are more likely to get infected
- Exposure to child and institutional care centers
- Having a weakened immune system
- HIV or AIDS
Your health care provider will ask if you have traveled out of the country recently and whether you have recently lost weight. If your health care provider thinks you have an intestinal parasite, you will probably have one or more of the following tests:
- Fecal testing (examination of your stool) can identify both helminths and protozoa. Stool samples must be collected before you take any antidiarrhea drugs or antibiotics, or before x-rays with barium are taken. Several stool samples may be needed to find the parasite.
- The "Scotch tape" test identifies pinworm by touching tape to the anus several times, then looking at the tape under a microscope for eggs.
- Your health care provider may use x-rays with barium to diagnose more serious problems caused by parasites, although this test is usually not required.
Your health care provider will choose the drug that is most effective against your intestinal parasite. You may need one dose, or you may have to take the medication for several weeks. Be careful to take the medicine exactly as it is prescribed, or it may not work.
Complementary and Alternative Therapies
Conventional medical treatments can get rid parasites more quickly and with fewer side effects than most alternative treatments. Alternative treatments may be helpful along with conventional medications. However, your health care provider must find out what kind of organism is causing your problems before you start treatment. The following nutritional guidelines may help keep parasites from growing.
Nutrition and Supplements
- Avoid simple carbohydrates, such as those found in refined foods, fruits, juices, dairy products, and all sugars, except honey.
- Eat more raw garlic, pumpkin seeds, pomegranates, beets, and carrots, all of which have been used traditionally to kill parasites. In one study, researchers found that a mixture of honey and papaya seeds cleared stools of parasites in 23 out of 30 subjects. Drink a lot of water to help flush out your system.
- Eat more fiber, which may help get rid of worms.
- Probiotics (Lactobacillus acidophilus, Lactobacilus plantarum, Saccharomyces boulardii, and bifidobacteria help keep your digestive tract healthy. Probiotics may not be appropriate in some serverly immune compromised patients. Talk to your doctor.
- Digestive enzymes will help restore your intestinal tract to its normal state, which makes it inhospitable to parasites. Papain is an enzyme from the papaya plant that may help kill worms when taken 30 minutes before or after meals.
- Vitamin C supports the immune system. Lower the dose if diarrhea develops.
- Zinc (20 - 30 mg per day) -- also helps support the immune system. Zinc may interact with certain medications, particularly some antibiotics, and it may not be appropriate for people with HIV/AIDS. Talk to your doctor.
Herbs are a way to strengthen and tone the body's systems. As with any therapy, you should work with your health care provider to diagnose your problem before starting any treatment. You may use herbs as dried extracts (capsules, powders, teas), glycerites (glycerine extracts), or tinctures (alcohol extracts). People with a history of alcoholism should not take tinctures.
Many of the herbs used to treat intestinal parasites have toxic side effects or interfere with other medications. Use them only under the supervision of a qualified practitioner. Your health care provider should treat you with the most gentle herb that is effective for the type of parasite you have. A few of the herbs that your health care provider might consider include:
- Garlic (Allium sativum)
- Barberry (Berberis vulgaris)
- Goldenseal (Hydrastis canadensis)
- Oregon grape (Berberis aquifolium)
- Anise (Pimpinella anisum)
- Wormwood (Artemisia annua)
- Curled mint (Mentha crispa)
- Black walnuts (Juglans nigra)
As with other treatments, your health care provider must first diagnose the kind of parasite you have. Before prescribing a remedy, homeopaths take into account a person's constitutional type -- your physical, emotional, and intellectual makeup. An experienced homeopath assesses all of these factors as well as any current symptoms when determining the most appropriate remedy for a particular individual. The following remedies may be used:
- Cuprum oxidatum nigrum
Your health care provider will retest your stool to be sure your parasite is gone, and will give you advice to help you avoid getting infected again. Follow these instructions carefully. Getting a parasite a second time can cause more serious health problems.
The seriousness and length of illness varies with the specific intestinal parasite. Complications happen more often in older people and in people who already have serious illnesses, such as AIDS.
Intestinal parasites can be more serious if you are pregnant. Your health care provider will tell you which drugs are safe to take during pregnancy. You doctor should closely monitor any treatment for intestinal parasites during pregnancy.
Alum A, Rubino JR, Ijaz MK. The global war against intestinal parasites--should we use a holistic approach? [Review]. Int J Infect Dis. 2010;14(9):e732-8.
Betti L, Trebbi G, Majewsky V, Scherr C, Shah-Rossi D, Jäger T, Baumgartner S. Use of homeopathic preparations in phytopathological models and in field trials: a critical review. Homeopathy. 2009 Oct;98(4):244-66. Review.
Dinleyici EC, Eren M, Dogan N, Reyhanioglu S, Yargic ZA, Vandenplas Y. Clinical efficacy of Saccharomyces boulardii or metronidazole in symptomatic children with Blastocystis hominis infection. Parasitol Res. 2011;108(3):541-5.
El-On J. Current status and perspectives of the immunotherapy of leishmaniasis. Isr Med Assoc J. 2009 Oct;11(10):623-8. Review.
Farthing MJ. Treatment options for the eradication of intestinal protozoa. Nat Clin Pract Gastroenterol Hepatol. 2006;3(8):436-45.
Guarner F. Prebiotics, probiotics and helminths: the 'natural' solution? Dig Dis. 2009;27(3):412-7. Review.
Lima AA, Soares AM, Lima NL, Mota RM, Maciel BL, Kvalsund MP, Barrett LJ, Fitzgerald RP, Blaner WS, Guerrant RL. Effects of vitamin A supplementation on intestinal barrier function, growth, total parasitic, and specific Giardia spp infections in Brazilian children: a prospective randomized, double-blind, placebo-controlled trial. J Pediatr Gastroenterol Nutr. 2010;50(3):309-15.
Okeniyi JA, Ogunlesi TA, Oyelami OA, Adeyemi LA. Effectiveness of dried Carica papaya seeds against human intestinal parasitosis: a pilot study. J Med Food. 2007;10(1):194-6.
Ottenhof M, Baidjoe A, Mbugi EV, Demir AY, Wielders JP, Savelkoul HF, Verhoef H. Protection against diarrhea associated with Giardia intestinalis Is lost with multi-nutrient supplementation: a study in Tanzanian children. PLoS Negl Trop Dis. 2011;5(6):e1158
Ritchie BK, Brewster DR, Tran CD, Davidson GP, McNeil Y, Butler RN. Efficacy of Lactobacillus GG in aboriginal children with acute diarrhoeal disease: a randomised clinical trial. J Pediatr Gastroenterol Nutr. 2010;50(6):619-24.