Also, the weight challenges of some people can be directly attributed to tapeworms. This is especially true of weight loss programs that don't work. The person may be hosting a tapeworm which is eating all the food and making the person constantly hungry. Tapeworms can also cause water retention. Besides tapeworms from beef, pork and fish, there is also a type of dog tapeworm you can get when dogs lick your face or hands.
Pinworms are very infectious and can cause a lot of itchiness in the anal area.
Pinworms can also be found in the vulva, uterus and fallopian tubes because the female worm loses her way while trying to return to the anus after depositing her eggs. Another type of roundworm that can be present in humans is whipworms. These insidious creatures actually inject a digestive fluid which converts the colon tissue into liquid which the worms suck up. Dr. Norman Stoll, a former worm expert at the Rockefeller Institute for Medical Research, estimated that the roundworm infects about 644 million people in the world. Dr. Brooks believes nutritional deficiencies are seen in heavy roundworm infections.