It starts with something small.
A child who cannot sleep, tossing and turning restlessly, a tiny voice whispering, “Mummy, my bottom is itchy.”
Many parents dismiss it as dryness, sweat or poor hygiene, but persistent anal itching in children, especially at night, should never be ignored.
Sometimes, it is the body’s quiet signal that something microscopic is happening.
One of the most common causes of nighttime anal itching in children is an infection caused by the pinworm Enterobius vermicularis.
These tiny intestinal worms are surprisingly common worldwide, and spread easily in schools and daycare settings.
In 2025, an updated review published in the medical journal Current Pediatric Reviews reaffirmed that E. vermicularis remains one of the most common parasitic infections affecting children worldwide.
The review highlights that the pinworm continues to affect an estimated 30% of children globally, with higher frequency in developing regions, particularly among preschool and school-aged groups where close contact facilitates transmission.
Night-time anal itching remains the hallmark symptom due to the nocturnal migration of female worms.
What happens is the female worm migrates to the anal area to lay eggs at night, and that is when the itching becomes intense.
The problem is not just the itch.
When children scratch, the microscopic eggs stick to their fingernails.
From there, they can spread to toys, bedding, clothes, and even into the child’s mouth, thus restarting the infection cycle.
Without treatment, this cycle can continue for weeks, or even months.
Parents should be alert to persistent itching around the anus, disturbed sleep, irritability or unusual restlessness, and occasionally mild abdominal discomfort.
In girls, untreated infections may sometimes lead to vaginal irritation if the worms migrate “next door”.
The good news is that pinworm infection is easily treated with prescribed medication, but medication alone is not enough.
Hygiene measures are crucial, including thorough handwashing, trimming fingernails short, daily bathing, and washing bedding in hot water.
Often, the entire household needs treatment to prevent reinfection.
However, not all itching at the bottom is caused by worms.
Other possible causes include skin irritation from soaps or wet wipes, diaper rash in younger children, fungal infections, allergic reactions, or excessive sweating.
Rarely, persistent itching may signal underlying gastrointestinal issues or dermatological conditions.
If itching continues despite basic hygiene measures, or is accompanied by additional symptoms such as weight loss, severe abdominal pain or blood in the stool, medical consultation is essential.
So, can parents ignore this symptom?
If it happens once and resolves quickly, perhaps.
But if the itching is recurrent, especially at night, it deserves attention.
Children often do not have the vocabulary to explain discomfort clearly, and what sounds like a small complaint may be their only way of asking for help.
Dr Vinoth Kumarasamy is a parasitologist and lecturer at Universiti Kebangsaan Malaysia. For more information, email starhealth@thestar.com.my. The information provided is for educational and communication purposes only, and should not be considered as medical advice. The Star does not give any warranty on accuracy, completeness, functionality, usefulness or other assurances as to the content appearing in this article. The Star disclaims all responsibility for any losses, damage to property or personal injury suffered directly or indirectly from reliance on such information.
