Children, Screens and the Neck: How Much Posture Really Matters

There is a scene you know: him on the sofa, tablet resting on his legs, chin practically on his chest, motionless for forty minutes. And you call out from the kitchen the sentence everyone says, sit up straight, getting exactly thirty seconds of results.

Here is the conclusion straight away, then I explain where it comes from: the way he holds his neck matters much less than you have been told, and how long he stays still in a row matters more. What can really be worked on is not the right posture: it is where the screen rests, how often he gets up and how much he moves in the rest of the day.

How much time they really spend

Let us start with the real numbers, because on this topic people almost always argue by guesswork.

The largest meta-analysis on changes in screen time pooled 46 studies and 29,017 children, with an average age of 9. Before the pandemic, they spent on average 162 minutes a day, that is 2.7 hours, in front of a screen; during the pandemic the time grew by 84 minutes a day, an increase of 52%. The biggest rise was among those aged 12 to 18 (110 extra minutes a day); the ones that grew most were personal computers (46 minutes) and, close behind, hand-held devices (44 minutes).

The second number concerns the whole set of movement habits. In a meta-analysis of 387,437 young people aged 3 to 18 in 23 countries, only 7.12% met all three 24-hour recommendations, covering physical activity, screens and sleep. Among adolescents the share collapsed to 2.68%.

Put simply: your son is not a borderline case, he is the norm. And we are not talking about correcting an anomaly, but about managing an ordinary condition.

What the studies really say about neck pain

One uncomfortable point needs saying straight away: the evidence on screens and neck pain in children is largely cross-sectional. Cross-sectional means that how many hours the phone is used and whether the neck hurts are measured together, on the same day, so you do not know which came first. The phone may cause the pain, but it may also be that someone in pain moves less and stays more still with the phone in hand.

The systematic review with meta-analysis on sedentary behaviour and neck pain in children and adolescents found 15 studies, all cross-sectional, and was able to pool seven of them:

• prolonged phone use: odds ratio 1.36 (95% CI: 1.001 to 1.85). Significant, but only just;
• screen time in general: odds ratio 1.13 (0.98 to 1.30), so not significant. It became significant (1.30) only after removing one study in a sensitivity analysis;
• prolonged sitting time: a significant association, but reported in only two studies.

The authors call it a weak association. An earlier review, which had sifted through 9,908 articles and included 45 on touch-screen devices and musculoskeletal symptoms, was even more definite: the evidence was limited, and no longitudinal study had been identified.

The study that followed teenagers over time

Then came what had been missing. In Singapore, 1,691 adolescents aged 10 to 19 were followed for one year. Those who used a smartphone at the start had a higher likelihood of reporting symptoms in the neck and shoulders twelve months later (OR 1.61, 95% CI: 1.06 to 2.44) and in the lower back (1.86). For the tablet, the association concerned the neck and shoulders, the lower back and the arms, with odds ratios between 1.33 and 1.52.

But the most useful detail runs against common sense: in this study the duration of use was not associated with symptoms. What was associated was the way they were used: the length of uninterrupted sessions, the type of activity, doing several things at once. It is the only prospective study we have on device use, and it is entirely self-reported with a questionnaire: it does not demonstrate a causal link, but it is the best clue that the total number of hours matters less than how long they stay still without changing anything. In other, cross-sectional studies, the total hours are instead associated with pain: we come back to that later.

The neck angle: what really happens

The mechanics exist and can be measured, although the consequences are less dramatic than they are often presented.

In the laboratory, with 18 participants carrying out three typical tasks (messaging, browsing, video), the forward tilt of the head was between 33 and 45 degrees from the vertical. Writing messages produced the largest angle, and sitting produced a larger angle than standing (the plausible explanation: when standing, the body sways and shifts position constantly, while sitting much less so). Pay attention to what this study measures: how far the head tilts, not how much the neck hurts.

In children there is a direct measurement. Thirty-four boys aged 5 to 12 were photographed while using a smartphone, and again half an hour after they had stopped. Those who used it more than 4 hours a day had greater angles of head and neck flexion and a smaller craniocervical angle than those who used it less, in both positions examined; and in both groups the craniocervical angle worsened when sitting compared with standing, both during use and half an hour later. It is a small study, boys only and observational: it shows that children who use the phone a lot hold themselves more hunched, not that the phone hunched them.

The figure about "kilos on the neck"

The number going round everywhere, tens of kilos of load on the cervical spine when you tilt your head forward, comes from a three-page article published in 2014 in a surgical technology journal. It is a calculation based on a biomechanical model, not a measurement on real children: the record does not even include an abstract with results, only the premise.

The point is not that the calculation is wrong, it is that an estimated load is not a pain. The neck bears loads all day without hurting, and the check on real people says something different.

Where the tablet rests matters more than how they sit

Here the numbers are concrete and immediately usable. Twenty-five children aged 10 to 12 played for fifteen minutes on a tablet in three different set-ups, with pain measured straight afterwards and the electrical activity of the neck muscles recorded:

How the tablet rests	Neck pain (0-10)	Activity of the neck extensor muscles
On the table, on a tilted stand	0.37	22.4
On the table, flat	1.74	35.4
On the lap	1.72	35.3

Roughly four times the pain and one and a half times the muscle activity for the same child, the same game and the same minutes: the only thing that changed was the height and tilt of the screen. Two honest qualifications: the values are low in absolute terms, since 1.7 out of 10 after a quarter of an hour is not a child who is unwell, and on the lap and flat on the table gave the same result. What makes the difference is the tilted stand, not the lap itself.

Why might a tablet be more demanding than a smartphone? No study has compared them directly on this point, and in the Singapore prospective study the tablet's odds ratios were actually lower than the smartphone's, although they concerned more body areas (neck and shoulders, lower back and arms). The reasons that follow are mechanical: a plausible line of reasoning, not a measured result.

1. It is bigger and heavier, so it tends to end up resting on the legs or the table instead of being held up at eye level as people instinctively do with a phone;
2. It occupies both hands, so the arms stay busy and the shoulders rise;
3. It immobilises more: in a laboratory study of ten children aged 3 to 5, during tablet play the average angles of head, trunk and arm were greater than during television and than during non-digital games, and compared with those games there was less postural variation, more time seated and less physical activity. Ten children in a laboratory are few: take it as a clue, not as proof.

An older study of 18 children of about five and a half adds the honest nuance: compared with a desktop computer, the tablet gave less neutral spinal postures and more muscle activity in the neck and shoulders, but with greater variability. Worse as an average position, better as movement, and that is why the average position on its own explains little.

Then there is the position nobody talks about. In a cross-sectional study of 233 Thai pupils, 53% used their smartphone lying down, and the face-down position was associated with a risk of musculoskeletal disorders 7.37 times higher than sitting. Again a snapshot: it shows the two things go together, not that lying face down is what causes the pain.

"Sit up straight": the sentence that does not survive testing

One thousand, one hundred and eight seventeen-year-olds in Australia were photographed while seated and classified, with markers placed on bony landmarks, into four ways of holding the neck and trunk: upright, intermediate, slumped chest with head forward, upright chest with head forward.

The result: no significant difference in the probability of neck pain or headache between the four groups. The authors write that the finding calls into question the widespread beliefs about the role of posture in adolescent neck pain. This too is a cross-sectional study, photos and questionnaire on the same day, and it counts as such: it does not show that posture is harmless, it shows that it does not separate those who hurt from those who do not.

There are two interesting nuances: those who sat with a slumped chest and head forward were more likely to have depressive symptoms, and those who sat upright did more physical exercise. Posture is more a mirror of how someone is and how much they move than a cause of pain.

The same four groups reappear in Posture at school and the schoolbag: what really matters; the two measures that count for the homework desk are in Desk and chair for homework.

The factor that recurs most: the amount of time still

If you take posture out of the centre, what remains is time and movement. Here the evidence is more abundant, but almost all of it is still cross-sectional and not unanimous.

In the Danish birth cohort, 45,555 pre-adolescents were interviewed at age 11. Compared with those who spent less than 2 hours a day in front of a screen, those who spent 6 hours or more had a relative risk ratio (RRR) of severe spinal pain of 2.49 in girls (95% CI: 2.13 to 2.92) and 1.95 in boys (1.65 to 2.32); being physically inactive raised it further (RRR 1.22; 95% CI: 1.10 to 1.34), compared with those who were moderately active. Two caveats: here "spinal pain" covers the neck, back and lower back together, and the two measures were collected at the same moment, so the authors themselves call for prospective studies to establish a causal link.

In the Finnish birth cohort, in a cross-sectional survey of nearly six thousand 15- and 16-year-olds, prolonged sitting time was associated with neck and nape pain in both sexes. And the baseline numbers help calibrate the anxiety: almost half of the girls and a third of the boys reported mild pain in the neck, nape or shoulders, while severe pain affected 5% of girls and 2% of boys. In adolescence neck discomfort is common, serious problems are rare.

The study with the most robust design is Norwegian: responses collected between the ages of 13 and 19 from 1,433 teenagers, with neck pain measured eleven years later. The factors associated were already having neck and shoulder pain (OR 2.0; 95% CI: 1.3 to 3.0), loneliness (2.0; 1.2 to 3.5), headache or migraine (1.7; 1.2 to 2.6), being female (1.9; 1.3 to 2.9) and, with intervals that touch 1, that is at the edge of significance, back pain (1.5; 1.0 to 2.4) and low physical activity (1.6; 1.0 to 2.5). Those who had all of them reached a probability of 67% in girls and 50% in boys. Read the list again: there is the pain that is already there, there is how someone is, there is how much they move. Screens and posture do not appear, but for a precise reason, which is right to state: in this study they were not among the things measured, so they were not tested and discarded. The point is another one: without looking at screens or postures, eleven years later a great deal was already predictable.

The honest part: movement is not a guaranteed shield

It would be convenient to close with "get them moving more and everything passes", but the evidence does not allow it.

In a Danish study that measured physical activity with an accelerometer, not a questionnaire, on 906 young people aged 11 to 15 followed for two years, there was no association between physical activity levels and spinal pain, either cross-sectionally or longitudinally. And in the Finnish cohort a high level of physical activity was associated with more severe pain in the neck and shoulders in girls.

On lower back pain, not neck pain (the distinction matters), a dose-response meta-analysis of 57,831 participants, all observational studies, found an increase in risk of 8.2% for each daily hour of computer use (pooled OR 1.32; 95% CI: 1.05 to 1.60), with a borderline association for the phone (1.32; 1.00 to 1.64) and a very small, though significant, one for television (1.07; 1.04 to 1.09).

In short, time spent still is the factor that recurs most often among those measured, almost always however in cross-sectional studies, which do not establish which came first. It is not a magic lever: it is the least bad lever you have, and it has the advantage of being good for sleep, mood and weight anyway.

What to change for real, from tonight

Three things, in order of how well they are supported.

1. Raise the screen. It is the intervention with the clearest result behind it: about four times less pain measured straight afterwards, all else being equal (at low values, and in a single study of 25 children). You do not need to buy anything sophisticated: a case with a stand that keeps the tablet tilted on the table is enough. The rule: the screen rises towards the eyes, the eyes do not drop towards the screen. With a smartphone, an elbow resting on the table or the armrest does the same job.

2. Break up the sessions. Do not cut the total hours: cut the uninterrupted sessions, which is what the only prospective study on devices actually linked to symptoms. In the experiment closest to the topic, though carried out on 44 young women aged 18 to 25, neck pain rose after twenty minutes and kept rising up to 41; and those who added an upright posture, rest for the eyes and stretching to their breaks ended up better than those who only took breaks. Twenty minutes is a reasonable order of magnitude even for a child, but it is taken from adults: a timer, the end of a level, the end of an episode.

3. Add movement, without expecting miracles for the neck. The World Health Organization's recommendation for children and adolescents is an average of 60 minutes a day of moderate to vigorous activity, plus muscle strengthening. On sedentary time the same guidelines recommend reducing it, but state explicitly that the evidence is not enough to quantify a threshold: anyone who gives you a magic number of hours is going beyond what is known.

One note of realism, finally. The meta-analysis of 204 studies of interventions to reduce screen time in children found an overall small effect, and the ones that worked better had explicit goals, feedback and planning: concrete, agreed rules, not lectures. This also applies at home: "don't spend so long on the tablet" is not a rule, "the tablet sits on the stand and at the end of the episode you go down to the courtyard" is one.

What you can stop doing

• Correcting the child out loud every five minutes. No study has measured what effect saying it has, but in the studies that looked for a protective posture none emerged: what remains is the wear on the relationship, with no proven benefit.
• Buying posture correctors and straps for a child without a diagnosis. There is no evidence they are needed, and in the available data the problem does not seem to be the position.
• Expecting furniture to do the work. In a quasi-experimental study of 88 adolescents, with height-adjustable desks, reminders and posters, energy expenditure increased and waist circumference fell, but there was no effect on musculoskeletal discomfort.
• Frightening the child. Telling a nine-year-old that they are ruining their spine is not supported by the data, and it is an excellent way to teach them to fear their own body.

When it is not the screen: the red flags

A discomfort that appears after an afternoon sitting still and goes away when the child moves is the most common situation and does not require tests. There are, however, signs that have nothing to do with the tablet and should be taken to the paediatrician, not managed with ergonomics:

• fever with a stiff neck, and the child cannot touch their chin to their chest;
• pain appearing after an injury: a fall, a blow, a sports collision;
• pain that wakes the child at night, or that is present even when he is not in front of a screen;
• pain that lasts for weeks without ever having a better moment, or that gets progressively worse;
• the head stays tilted to one side and does not straighten, or a new tilt has appeared;
• tingling, weakness or loss of strength in the arms and hands, changes in handwriting, difficulty walking;
• headache that gets worse over time, is present on waking, or comes with vomiting;
• weight loss, fever that will not go away, swollen lymph nodes, a child who is clearly unwell;
• the child has stopped doing things they used to do.

For two of these you do not wait. Fever with neck stiffness, or weakness, persistent tingling and difficulty walking, must be assessed urgently, not on Monday morning, and they are not a matter for physiotherapy, either online or in a clinic.

This list is not ours. The interdisciplinary recommendations on back pain in paediatric age, written for back pain rather than neck pain, but that is where the warning signs come from, list among the things not to neglect: fever, motor or sensory disturbances in the limbs, radicular pain, problems controlling the bladder and bowel, trauma, swollen lymph nodes, and age under 10, which in itself is a reason to look more closely at a pain that does not go away. On a head that stays tilted, the leading paediatric guide is clear: torticollis is a symptom, not a diagnosis, and for some of its causes time matters.

If the subject is recurring headache, the criteria for telling it apart are in Headache in children: when to worry; if the neck hurts for days without other signs, the overall picture is in Cervical pain in children.

Adults are a different story

On neck strain from smartphones in adults there is a dedicated article: Tech neck: what the studies really say. It is useful, but it is about a different population, and the difference is not cosmetic: an adult often spends eight hours at a fixed workstation and repeats the same gesture for years, while a child changes position dozens of times a day and has growing tissues. Among the fifteen- and sixteen-year-olds in Finland, severe pain was rare, 5% of girls and 2% of boys, and in the study that looked at eleven years later, what weighed were the pain already present, loneliness and headache: no device, which in that study was not even among the things measured. Applying office ergonomic recommendations wholesale to an eight-year-old is the quickest way to turn a non-problem into daily anxiety.

What a physiotherapist can do (and what they cannot)

In the great majority of cases no therapy is needed because a child hangs their head over a tablet. What is needed is for someone to look at how they really use it, in their room, on their sofa, with their own device, and tell you two or three things to change this week. And it is needed, when pain is already there, to understand whether behind it are the things that really count in the studies: how much he moves, how he sleeps, whether he has headaches, how he is doing.

It works well by video call, because the place to look is your home and not a clinic. With Ri-Hub Junior you start with a free twenty-minute introductory consultation with a physiotherapist on the Italian professional register who works with children and teenagers: they show us the set-up, we assess the neck and tell you what to fix. Up to age 10 sessions last 50 minutes and cost 59,90 €; from age 11 to 18 they are standard sessions at 29,90 €.

If instead there is a complex neurological or neuromuscular condition involved, the right place is not us: those pathways require in-person assessment and specialised centres, and we say so straight away rather than waste your time.

If the child keeps their mouth open even when they are not looking at a screen, the cause is something else and needs to be looked for elsewhere: Child who breathes through the mouth.

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Last source check: September 2026.