Thread by @ZdenekVrozina

When a child looks fine after COVID but is suddenly exhausted, foggy, short of breath, or no longer coping with school the way they used to, parents often feel something is wrong long before anyone can explain it🧵

This review argues that long COVID in children is real, often underestimated, and important to take seriously - not to create panic, but to help families recognize it early and respond with care and common sense.

This review makes one central point very clearly - long COVID can affect children and teenagers in meaningful ways, even after a mild infection, and even when routine tests do not show anything dramatic.

The authors describe long COVID in young people as a broad, mixed, and often frustrating condition. It does not look the same in every child. Some mainly struggle with exhaustion. Others develop headaches, poor concentration, dizziness, palpitations, chest discomfort, sleep problems, anxiety.

In many cases, symptoms come and go, fluctuate over time, and get worse after physical or mental effort. That unpredictability is one of the reasons families can feel dismissed or confused.

There is no single lab test that can prove long COVID. Doctors usually have to rely on the pattern of symptoms, the timing after infection, the effect on daily life, and the exclusion of other causes. So a child can have normal basic results and still be genuinely unwell. That point really matters, because many parents worry that if tests are normal, the problem must not be real. The review strongly suggests otherwise.

The article highlights fatigue and reduced exercise tolerance as some of the most common problems. This is not just ordinary tiredness. In some children, even a normal school day, a sports practice, or a mentally demanding afternoon can trigger a crash afterward.

The review points to the idea of post-exertional malaise, meaning symptoms can worsen after effort. For parents, this is one of the most practical and important concepts in the whole paper, because it explains why pushing a child too hard can backfire.

Another major issue is brain fog. Children may struggle with memory, concentration, processing information, reading, or finishing tasks. They may seem distracted or slower than before. One especially interesting point in the article is that these problems can sometimes resemble ADHD on the surface.

The review also describes headaches, poor sleep, muscle and joint pain, chest tightness, shortness of breath, chronic cough, palpitations, and dizziness. Some children appear to develop signs of autonomic dysfunction, including POTS, where standing up can trigger a racing heart, weakness, lightheadedness, or even fainting.

The article makes it clear that these symptoms can still be deeply disruptive.
The authors acknowledge that emotional distress, disrupted routines, social isolation, and the broader effects of the pandemic can also shape how children feel and function.

They present long COVID as something that often sits at the intersection of physical symptoms, nervous system changes, immune effects, school stress, sleep disruption, and mental health strain. For parents, that is a much more realistic and useful way to think about it.

The authors discuss possible mechanisms such as immune dysregulation, viral persistence, endothelial dysfunction, microcirculatory changes, and autonomic nervous system involvement.

The review explicitly reports immune abnormalities in children with long COVID, including changes in T and B lymphocytes and an imbalance in regulatory T cells, and it also mentions the possibility of viral reservoirs, endothelial dysfunction, and microcirculatory damage.

There are plausible biological models for why some children continue to feel unwell after infection!

One of the most parent-relevant themes in the review is how much long COVID can affect school performance and participation. A child may physically attend school but still be unable to cope with the cognitive load, noise, pace, social demands, and sustained attention.

They may come home completely drained, struggle to finish homework, or gradually stop being able to keep up.
That is why the article supports school accommodations when needed.

For families, this is one of the clearest signs that the illness is not only about symptoms - it can genuinely reshape a child’s development and daily life.

The review spends time on anxiety, depression, low mood, stress reactions, and even PTSD, especially in children who were severely ill. It also notes that the family can be affected too. Parents may feel helpless, overwhelmed, or traumatized by the uncertainty.

In other words, mental health support may be necessary and helpful without meaning the illness is all in the child’s head.
That distinction is crucial for families, because many parents have encountered exactly that kind of dismissive framing.

The review recommends a targeted, symptom-led evaluation. That means the workup should depend on what is most prominent. If a child mainly has breathing problems, lung testing may be appropriate. If they have palpitations and dizziness, a cardiac or autonomic evaluation may be more relevant. If headaches and cognitive issues dominate, neurological assessment may matter more.

Possible tests mentioned include lung function tests, imaging when indicated, ECG, echocardiography, inflammatory markers, blood work, thyroid tests, and in some cases more advanced evaluations. For suspected POTS, the article mentions standing tests or tilt-table testing.

For children with POTS-like symptoms, the article mentions measures such as hydration, increased salt intake, compression garments, exercise adapted to tolerance, and sometimes medications like beta-blockers, fludrocortisone, midodrine, or ivabradine. But the authors also acknowledge that strong pediatric evidence is still limited.

This is a valuable review because it presents pediatric long COVID as real, varied, imperfectly understood, and deserving of careful, individualized care.

Caliman–Sturdza at al., Management of long COVID-19 in children and adolescents: from diagnosis to therapeutically approaches. tandfonline.com/doi/epdf/10.10…