Teen fatigue causes

 

What are the most common teen fatigue causes?

If your teenager is constantly exhausted, you’re not alone. Many parents are searching for answers when it comes to teen fatigue causes — and the truth is, there’s rarely just one. From sleep issues to mental health challenges, understanding what’s behind your teen’s tiredness is the first step toward helping them feel better.

You’re not alone. Many mums come to us at New Pathways feeling overwhelmed and unsure how to help their child. The truth is, teen fatigue is very common, but it’s not always something they’ll just “grow out of.” Sometimes it’s a sign their body—or mind—is struggling and needs proper support.

Let’s walk through the five most common reasons teenagers feel so tired, and what you can do to support them.

1. They’re Recovering from a Virus—Even if It Was Months Ago

What You Need to Know About Post‑Viral Fatigue and Long COVID

Lots of teens bounce back quickly after an illness. But for some, a virus like glandular fever (mono), flu, or COVID-19 can trigger long-term fatigue that doesn’t go away. This is called post-viral fatigue, and it’s more common than people realise—especially since COVID.

In some cases, it develops into something known as Long COVID, where symptoms like tiredness, brain fog, headaches and aching muscles last for months. Even a mild initial illness can leave a teen feeling wiped out long after the infection has passed.

2. They’re Not Getting the Sleep They Need (Even If They’re in Bed for Hours)

Why Sleep Gets Messy for Teens

Teenagers' body clocks shift during puberty, making it harder for them to fall asleep before 10 or 11pm. But school starts don’t change to match, so they’re constantly running on empty. Add in screen time, revision stress, and social pressures, and it’s no wonder they’re tired.

Even if your teen is spending plenty of time in bed, they may not be getting quality sleep—especially if their mind is racing, or they’re scrolling late into the night.

3. They’re Missing Key Nutrients

Why Nutrition Matters More Than We Think

Busy teens often skip meals, snack on sugary foods, or follow restrictive diets without realising the impact on their energy levels. Low iron, vitamin B12, or vitamin D can all cause fatigue, weakness, and brain fog—and many teens are deficient without knowing it.

When to Get Checked

If your child looks pale, gets dizzy often, or seems unusually low on energy, it might be worth asking your GP for a blood test. Iron and vitamin D deficiencies are especially common in teenage girls.

4. Their Mental Health Might Be Taking a Toll

Fatigue Isn’t Always Physical

It’s heart-breaking to see your child lose their spark. Fatigue can be a symptom of emotional overwhelm, anxiety, or depression—especially if they’re dealing with school stress, friendship issues, or just feeling under pressure. Post viral fatigue

Some teens won’t come out and say they’re struggling. Instead, they might withdraw, sleep more, or avoid things they used to enjoy.

5. They May Be Developing Chronic Fatigue Syndrome (CFS/ME)

What Is CFS/ME?

CFS (also known as ME) is a serious condition that causes long-term exhaustion, poor concentration, pain, and unrefreshing sleep. It can start after a virus or build up slowly over time.

Around 1 in 100 teens may be affected. It’s more than “feeling tired”—CFS can be completely life-altering, especially without early support.

 

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