Skip to content 
If your child has been waking up at night scratching or complaining of itching around the bottom, it can be worrying—and confusing. One common cause of this symptom in children is pinworms, a small but highly contagious intestinal parasite.
The good news is that pinworm infections are very common in children and, with proper care, they are treatable and manageable. Understanding what they are and why they cause symptoms—especially at night—can help you respond calmly and effectively.
🧠 What are pinworms?
Pinworms (also called threadworms) are tiny, white, thread-like worms that live in the intestines. They are most common in school-aged children but can affect anyone.
Children often get them through:
- Touching contaminated surfaces
- Putting unwashed hands in their mouth
- Close contact with other children
Because they spread easily, they are common in households, schools, and daycare environments.
🌙 Why do pinworms cause itching at night?
The main symptom—intense itching around the anus at night—has a very specific reason.
At night:
- Female pinworms come out of the intestine
- They lay eggs around the anal area
- This process causes irritation and itching
This is why symptoms are often worse when the child is trying to sleep.
⚠️ Common symptoms in children
Not all children show clear symptoms, but common signs include:
- Nighttime itching around the anus
- Restless sleep 😴
- Irritability or discomfort
- Frequent scratching
- Occasionally mild stomach discomfort
In some cases, parents may even notice tiny white worms in the stool or around the anal area.
🦠 How pinworms spread