“My child gets bored of everything,” “falls asleep when they get home from school,” “other kids run, but mine sits” — fatigue in children is one of the complaints parents bring to a neurologist most often. Fatigue itself is not a diagnosis but a symptom. Behind it, the most common causes are related to daily routine (sleep, nutrition, screens), followed by general medical causes (anemia, infections, the thyroid gland), and, more rarely, neurological and muscle diseases. A neurologist's job is to sort through these causes step by step — not to “prescribe vitamins.”
Tiredness or muscle weakness?
Telling these two apart is the key to the exam. Fatigue is a general lack of energy: the child doesn't want to, loses interest quickly, but can climb the stairs if they choose to. Muscle weakness is an objective loss of strength: the child lags behind peers on stairs, getting up from the floor (pushing on their knees with their hands) and running, walks on tiptoe, falls often, or has trouble combing their hair with their hands raised. Muscle weakness is a sign a neurologist looks at urgently.
The most common causes
- Sleep: too little sleep (school-age children need 9–11 hours, teenagers 8–10), going to bed late, waking at night, snoring and pauses in breathing during sleep (adenoids), screen use before bed
- Nutrition: skipping breakfast, iron deficiency and anemia, vitamin D deficiency, drinking too little water
- Screens and inactivity: long screen time, little physical activity
- Recent infections: fatigue that lasts several weeks after a viral illness
- Mood: stress, anxiety, signs of depression — in teenagers these often show up as fatigue
- The load of lessons and activities
Medical and neurological causes
An underactive thyroid, chronic infections, allergic diseases, heart and breathing problems, diabetes. On the neurological side: frequently recurring headache and migraine (58% of children have a headache at some point), brief absence seizures that go unnoticed during the day, side effects of some anti-seizure and allergy medications, sleep disorders (narcolepsy is rare but important), muscle and neuromuscular diseases (together with weakness), and the “inattentive” form of attention deficit. Chronic fatigue syndrome is a rare diagnosis in children and teenagers (about 0.5% up to age 18, according to a meta-analysis) and is made only after other causes have been ruled out.
The workup plan
- A detailed conversation: when the fatigue began and how it has gone, a sleep diary (1–2 weeks), nutrition, screen time, school load, mood, similar cases in the family.
- Neurological exam: muscle strength (getting up from the floor, stairs, walking on tiptoes and heels), reflexes, coordination, neurological status; height and weight, blood pressure, color of the skin and mucous membranes.
- Laboratory tests (as indicated): complete blood count, ferritin, vitamin D, thyroid hormones, blood sugar; if there is weakness — muscle enzymes (CK).
- Additional tests: an ENT and sleep study if breathing is disturbed during sleep; an EEG for “zoning out” episodes; electromyography and genetic testing for muscle weakness.
Frequently asked questions
Will it go away if I give my child vitamins?
If a deficiency is confirmed by a test, yes — treating it helps. Giving vitamins without knowing the cause wastes time and can hide the real cause.
My teenager can't wake up in the morning but has energy after noon
This is the typical picture of the biological sleep rhythm shifting later at this age. A steady bedtime and wake-up time, morning light and limiting screens in the evening help. If there are mood or school difficulties, an exam is needed. Sleep, screens and the child's brain
Should a child who tires easily skip sports?
On the contrary, regular moderate-intensity exercise reduces fatigue. The load is adjusted individually only when muscle weakness or a heart or breathing cause is found.
When should I hurry?
Urgent evaluation if weakness is growing fast, if your child can't walk, has trouble swallowing or breathing, or if fatigue comes with headache and vomiting, fever or weight loss.
Scientific sources
The medical information on this page is based on the following peer-reviewed publications (PubMed).
- Lim EJ və b. (2020). Systematic review and meta-analysis of the prevalence of chronic fatigue syndrome/myalgic encephalomyelitis (CFS/ME) J Transl Med. PMID 32093722
- Daoud AS və b. (1997). Effectiveness of iron therapy on breath-holding spells J Pediatr. PMID 9108851
- Abu-Arafeh I və b. (2010). Prevalence of headache and migraine in children and adolescents: a systematic review of population-based studies Dev Med Child Neurol. PMID 20875042
Medically reviewed by: Dr. Aynura IbrahimovaLast updated:
The information on this page is for education only and does not replace an examination by a doctor. If you are worried about your child, book an appointment. In an emergency, call 103.