Fatigue in children

Overview

Fatigue in children means feeling very tired and low on energy most of the time, even after getting enough sleep. It is more than just being sleepy after a late night – it can affect how a child plays, learns, and interacts with family and friends.

Yes, fatigue is one of the most common reasons parents bring their child to a doctor. It can affect children of all ages, from toddlers to teenagers.

Fatigue can affect any child, but it is more commonly reported in school-age children and teenagers, especially during periods of rapid growth, increased school pressure, or after illnesses.

Symptoms

Common symptoms

• Constant tiredness that doesn’t go away with rest
• Lack of energy for play or school activities
• Irritability or moodiness
• Difficulty waking up in the morning
• Poor concentration or forgetfulness

Symptoms in children

• Needing to nap when they have outgrown naps
• Complaining of feeling weak or heavy limbs
• Being more emotional or clingy than usual
• Losing interest in favourite toys or games

Symptoms in older adults

• Fatigue in older adults is often related to different causes like chronic illness, medication side effects, or sleep problems. This article focuses on children. If you are concerned about an older adult, please speak to their healthcare provider.

Causes

Main causes

• Not getting enough good-quality sleep
• Anxiety, stress, or depression
• Common infections like colds, flu, or glandular fever (mononucleosis)
• Anaemia (low iron levels)
• Chronic conditions like asthma, thyroid problems, or juvenile arthritis

Risk factors

• Being a teenager with busy school and social schedules
• Having a chronic health condition
• Poor sleep habits, like using screens before bed
• Lack of physical activity
• Family stress or major life changes (like moving house or starting a new school)

When to see a doctor

See a doctor urgently if:

• If your child has any of the emergency symptoms listed above, call your local emergency number right away.
• If your child is extremely sleepy, confused, or has a seizure

Book a routine appointment if:

• If your child has been tired for more than two weeks without a clear reason
• If the tiredness is stopping them from doing everyday things like playing or going to school
• If they also have symptoms like weight loss, pain, or a fever that comes and goes
• If you are worried about their mental health or mood

Diagnosis

The doctor will start by asking you and your child about their symptoms, sleep, diet, activities, and any recent illnesses. They will also do a physical examination to check for signs like pale skin, fever, or swollen glands.

Tests that may be done

• Blood tests to check for anaemia, infection, or other conditions
• Urine test to look for infection or diabetes
• Sometimes a sleep study (polysomnography) if a sleep disorder is suspected

What to expect at your appointment

The doctor may ask you to keep a diary of your child’s sleep, meals, and activities for a week or two. This can help identify patterns. Most tests are simple and not painful. The doctor will explain everything and answer your questions.

Treatment

Treatment for fatigue depends on the cause. The goal is to help your child regain energy and feel better. Many cases can be managed at home with healthy lifestyle changes. If a medical condition is found, the doctor will treat that directly.

Self-care at home

• Make sure your child gets enough sleep for their age (e.g., 9–12 hours for school-age children)
• Create a calming bedtime routine without screens
• Encourage regular physical activity, but not too close to bedtime
• Offer a balanced diet with plenty of fruits, vegetables, and whole grains
• Limit caffeine (found in cola, energy drinks) – it can disrupt sleep

Medical treatments

If the fatigue is caused by a condition like anaemia, the doctor may recommend iron supplements or changes in diet. For infections, rest and time are usually enough. For mental health concerns, talking therapies (like cognitive behavioural therapy) can be very helpful. A healthcare provider will tailor the treatment to your child’s needs.

When is surgery considered?

Surgery is almost never needed for fatigue alone. It might be part of treatment if an underlying condition (like a tumour or heart problem) is found, but that is very rare.

Living with this condition

Help your child pace themselves – break up tasks and plan rest times. Encourage them to stay involved in light activities they enjoy, as this can boost their mood and energy. Keep communication open with their school so teachers understand they may need extra support.

Lifestyle tips

• Stick to a regular sleep schedule, even on weekends
• Limit screen time before bed
• Make sure your child has time to relax and play
• Encourage social activities, but let them take breaks when needed

Diet and exercise

Offer small, frequent meals that include protein, healthy fats, and complex carbohydrates. Avoid heavy meals close to bedtime. Gentle exercise like walking or stretching can help, but don’t push if your child is too tired. Always check with a doctor before starting a new exercise plan.

Mental health and emotional wellbeing

Chronic fatigue can make children feel frustrated, sad, or anxious. They may worry about missing school or falling behind. It is important to talk about their feelings and reassure them. If you notice signs of depression (like ongoing sadness or loss of interest), seek help from a healthcare professional right away. Remember, if your child is struggling emotionally, crisis support is available – contact your local mental health helpline.

Prevention

Fatigue cannot always be prevented, especially when it’s caused by an infection or other illness. But many cases can be avoided by promoting healthy sleep, a balanced diet, regular activity, and managing stress. Teaching your child good sleep habits from a young age helps a lot.

Vaccines

Vaccines can prevent some illnesses (like flu and chickenpox) that might cause fatigue. Keeping up with the recommended vaccination schedule is a good idea. Talk to your doctor for more information.

Screening programmes

There is no routine screening for fatigue. Doctors may check for anaemia or other conditions if your child has ongoing symptoms. Regular well-child visits are a good opportunity to discuss any concerns.

Complications

If left untreated

• School performance can suffer due to poor concentration and missed days
• Social withdrawal and loss of friendships
• Worsening of underlying medical conditions
• Increased risk of depression or anxiety

Long-term outlook

For most children, fatigue gets better with time and the right care. Even when a chronic condition is the cause, managing it well can allow your child to live a full and active life. With support from family, school, and healthcare providers, children can learn to manage their energy and feel better.

Find support

Local organisations

• Your child’s GP or paediatrician · UK
• School nurse or health visitor · UK

Helplines

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