Immune Thrombocytopenia (ITP) in Children and Teens

Immune Thrombocytopenia, or ITP, is a rare autoimmune condition that can affect children and teenagers of any age. Most children recover within weeks or months, while others may have symptoms that last longer. Teenagers may experience ITP differently from younger children, and some may need ongoing monitoring or treatment.
Understanding how ITP affects children and teens can help families feel more prepared, supported, and confident when making decisions about care.

How ITP Presents in Children and Teens

ITP can appear suddenly in children, often after a viral illness. Many children feel completely well and only discover ITP after bruising or small red spots on the skin are noticed. Teenagers may experience more persistent symptoms or heavier bleeding.

Common symptoms include:

Easy or unexplained bruising
Small red or purple spots on the skin (petechiae)
Nosebleeds
Bleeding gums
Blood blisters in the mouth
Heavier or prolonged menstrual bleeding in teens
Feeling unusually tired

Most children remain active and playful, even with very low platelet counts. Symptoms vary widely and may change over time.

Why ITP Behaves Differently in Children and Teens

ITP in children and teens often follows a different pattern than in adults.

Children

Teens

More likely to develop persistent or chronic ITP
May experience heavier menstrual bleeding
May feel more impacted by fatigue
Often face emotional or social challenges related to school, sport, or identity
May transition to adult style treatment pathways

Understanding these differences helps families know what to expect and how to support their child or teen.

What Causes ITP in Children and Teens

In many children, ITP appears after a viral illness. The immune system becomes activated and mistakenly targets platelets. In teens, ITP may also be linked to:

In most cases, the exact cause is unknown.

How ITP Is Diagnosed in Children and Teens

ITP in children and teens is usually diagnosed based on symptoms, examination and simple blood tests. Most young people with ITP are otherwise well, with isolated low platelets and typical bruising or bleeding.

Doctors will usually:

Bone marrow tests are rarely needed
A bone marrow test is not routine in children. It may be considered only if:

Most families find it reassuring to know that diagnosis usually involves simple blood tests rather than invasive procedures.

When Children and Teens Need Treatment

Many children and teens with ITP do not need treatment straight away, and some never need treatment at all. Treatment decisions are based mainly on bleeding symptoms and overall risk, not just the platelet count.

Your child’s healthcare team will consider:

How much bruising or bleeding is happening
Whether there is any mucosal bleeding, such as nosebleeds or blood blisters in the mouth
Platelet count trends over time
Age, activity level and risk of head injury
How ITP is affecting daily life and wellbeing

For many young people, the safest and most appropriate approach is monitoring without treatment, often called “watch and wait.” This means regular check‑ups and blood tests, with clear advice on when to seek medical care if symptoms change.

What is ‘Watch and Wait’

For many young people, the safest and most appropriate approach is monitoring without treatment, often called watch and wait.

Watch and wait means:

This approach is safe for many children and teens and allows time for the immune system to settle and ITP to improve on its own.

Treatment Options for Children and Teens

If treatment is needed, it is usually because of significant bleeding, a higher risk of bleeding, or meeting the needs of your child or teen to ensure their mental and physical well-being, and not just for a low platelet count.

Short-term treatments

Short-term treatments may include:

These treatments are often used for a short time to control bleeding or prepare for surgery or procedures.

Long-term treatments

Longer-term treatment may be considered if:

Emergency treatments

Treatment options can include:

Emergency treatments such as platelet infusions, high-dose steroids or IVIg may be used if there is serious bleeding.

Your child’s healthcare team will talk through the benefits and side effects of each option and work with you and, where appropriate, your child, to decide what feels right.

School, Sport and Daily Life

Most children and teens with ITP can continue their usual activities. Your healthcare team may provide guidance based on platelet levels and symptoms.

School

Children can usually attend school as normal. Teachers may need to be aware of:

Sport and physical activity

Most activities are safe. Your doctor may advise caution with:

Menstrual health

Teen girls may experience heavier periods. Treatment options are available to help manage bleeding.

Emotional well-being

Children and teens may feel worried, frustrated, or different from their peers. Support from family, school, and community can make a meaningful difference.

Supporting Teens With ITP

Teenagers often have unique needs.

They may:

Want more independence in managing their health
Feel anxious about symptoms or appearance
Worry about school, sport, or social life
Need support with menstrual health
Benefit from connecting with peers who understand

The ITP & Me book has been designed specifically for teens and can help them feel informed and empowered.

When to Seek Medical Care

Seek urgent medical attention if your child or teen experiences:

Heavy or uncontrolled bleeding
Blood in urine or stool
Severe or unusual headaches
Vomiting or dizziness
A sudden drop in platelet count
Symptoms that feel unusual or concerning

If you are unsure, contact your doctor or local emergency service.

Support for Families, Children and Teens

Families often find support through:

Connecting with others can help families feel informed, supported, and less alone