Pinworms (Enterobiasis)
Pinworms are tiny, white parasitic worms that infect the human intestines and are the most common worm infection in the United States. They spread easily among children and household members through the accidental swallowing of microscopic eggs.
Overview
Pinworms are tiny, white parasitic worms that infect the human intestines and are the most common worm infection in the United States. They spread easily among children and household members through the accidental swallowing of microscopic eggs.
Symptoms
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Causes
- •Ingestion of microscopic pinworm eggs
- •Transfer of eggs from contaminated surfaces to the mouth
- •Inhalation of airborne eggs (rare)
Risk factors
- •Attending daycare or elementary school
- •Living in crowded conditions or institutions
- •Being a household member of an infected person
- •Poor handwashing habits
How it progresses
3 stages- OnsetSymptoms appear, often triggered by a known cause.Often missed
- Active phaseSymptoms peak; self-care or short treatment usually helps.
- ResolutionSymptoms ease over days to weeks with proper care.
How it's diagnosed
- •The tape test (collecting eggs from the anal skin)
- •Visual inspection of the anal area at night
- •Microscopic examination of samples
Treatment options
General educational information only — no dosage advice. Always follow guidance from a qualified clinician.
- •Over-the-counter pyrantel pamoate medications
- •Prescription anthelmintic drugs (mebendazole or albendazole)
- •Treating all household members simultaneously to prevent reinfection
- •A second dose of medication two weeks after the first
- •Wash bedding and towels in hot water daily
- •Scrub fingernails and keep them short
- •Daily morning showering to remove eggs
- •Frequent handwashing with soap and water
Complications
- •Reduced quality of life
- •Worsening symptoms over time
- •Recurrence of pinworms (enterobiasis)
Prevention
- •Maintain a healthy lifestyle
- •See a clinician for routine check-ups
When to seek help
- •Symptoms persist beyond a few days
- •Symptoms interfere with daily activities
- •New or worsening symptoms appear
- •Concerning changes related to pinworms (enterobiasis)
- Signs of skin infection from scratching (redness, pus)
- Severe abdominal pain
- Difficulty urinating
- Vaginal discharge or irritation in young girls
In any emergency, call your local emergency number or go to the nearest emergency department.
Real-world questions
- ›Can Pinworms (Enterobiasis) cause headaches?
- ›Is Pinworms (Enterobiasis) reversible?
- ›How quickly does Pinworms (Enterobiasis) progress?
- ›Is Pinworms (Enterobiasis) hereditary?
- ›Can Pinworms (Enterobiasis) be prevented?
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Frequently asked questions
Possible causes of Pinworms (Enterobiasis) include Ingestion of microscopic pinworm eggs, Transfer of eggs from contaminated surfaces to the mouth, Inhalation of airborne eggs (rare).
Pinworms (Enterobiasis) is generally mild, but severity can vary. Seek care if symptoms are severe or persistent.
Duration varies between individuals. Many cases improve with appropriate care, while others may persist longer and require ongoing management.
Some milder cases may improve with rest and self-care. If symptoms persist or worsen, consult a healthcare professional.
Consider seeing a clinician if symptoms are severe, persistent, worsening, or if you have any concerns related to general.
Sources
Information based on general medical references such as:
Last reviewed: May 2026