Pinworms Symptoms

Pinworms Symptoms

Pinworms symptoms

     Pinworms usually do not produce symptoms apart from mild perianal itching. Many people with pinworm infections have no symptoms and may not be aware of the infestation. Parasitosis passes without treatment.

     The most common symptoms of pinworm infection in children include:

  • Pruritus (itching) in the anus. In many children this symptom is easy. In very few cases this becomes a severe itching
  • Restless sleep (itching is worse at night).

     Other more rare pinworms symptoms are present:

  • Loss of appetite
  • Itching in the perineal region
  • Pain or burning during urination
  • Worms in the stool (very rare)
  • Skin rashes (hives)
  • Bruxism (to grind)
  • Enuresis (wet bed)
  • Abdominal pain (rarely, except the complications).

     The above symptoms can lead to anxiety.

     Other diseases with similar symptoms are the hemorrhoid disease and infection given by other intestinal parasites (Ascaris, Trichuris and Taenia). Signs and pinworms symptoms- the disorders caused by a pinworm infection are less important to adults than children.

     Pruritus (itching) anal, Vesper and on night, is an important sign of pinworm infection. It prevents the calm sleep of the child, the sleep being interrupted by nightmares. The child, tired, is irritable, and may prove difficult school tics (nasal itching). In girls, and less frequently in adulthood, the worms can penetrate the genitals and may cause painful or vulvo cystitis.

Physiopathogenic mechanism

     Pinworm eggs arrive in the body by mouth and turn into worms in the lower digestive tract. The eggs begin processing the small intestine and migrate into the large intestine where the adult worms pass. They survive by eating the intestinal content. Without treatment can survive in the digestive system of the person between 1 and 3 months.

     Adult females get out through the anus and lay eggs in the perianal region especially at night. The movements of this parasite during migration and deposit the eggs are considered to irritate skin and cause itching. The eggs have a wet and sticky surface so that when children scratch their perianal region, they stick to the fingers and reach under the fingernails. The eggs reach on objects such as cranes or food and from here to the mouth. They can also get into clothing, bedding and furniture. Eggs live outside the body up to 2 weeks if it is hot and a humid environment.

Modes of transmission

     Pinworm infection is spread by contact with a person who scratched the perianal region, and when the eggs were stuck to the fingers and reached under his fingernails. Infection occurs in the following conditions:

  • A no infected person brings his hand to mouth after contact with a parasitic person.
  • A no infected person touch any object infested with pinworm eggs (such as underwear, clothes, dishes or toys) and go his hand to the mouth.
  • Bed linen or clothing of a infected person when shaken helps the ventilation of the eggs. These eggs float in the air and can be swallowed by other people.

     An infected person can be reinfected by any means listed above or when eggs are caught by the perianal region and the larvae migrate back into the large intestine.

     Since treatment for pinworms attack only larvae and worms already formed, parasite eggs can continue to perpetuate a person already treated. Second treatment, applied to destroy parasites formed after initial treatment should be administered approximately 2 weeks.


     Complications of the pinworms are rare. The most common are skin infections of the perianal region and the genital area. It occurs due to skin irritation and itching due to bleeding in these areas.