How screen addiction manifests itself in teenagers, what impact it has and what parents can do

Digital platforms run on a simple logic: they keep the user in the loop. Algorithms anticipate impulses, deliver quick rewards and penalize any sign of autonomy, experts say.

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In such an ecosystem, teenagers (with a brain in full reorganization) become the ideal audience. “The digital environment offers short stimuli, intense feedback and fast reward mechanisms“, clinical psychologist and psychotherapist Geta Udrea explains for “Adevărul”. At stake is not just time spent online, but how these interactions shape attention, emotions, and self-regulation.

Geta Udrea details that constant notifications, seconds-long clips, non-stop scrolling and algorithmic recommendations create a rhythm of variable rewards, exactly the pattern that keeps the behavior activated. The reward isn't guaranteed, but the chance to get it is enough to keep the teen hooked. This structure not only captures attention, it fragments it: it increases the ability to switch tasks, but decreases the ability to stay in activities that require sustained concentration, such as reading or solving a complex assignment.

What happens in the adolescent brain

The psychologist explains that the dopaminergic system (reward center) is extremely reactive in adolescence. Short, repetitive stimuli deliver immediate rewards, and this dynamic reinforces the association between platform use and instant gratification, he says. “The ventral system, involved in reward anticipation, is also more sensitive at this age, amplifying the appeal of continued use.”

At the same time, the prefrontal cortex, responsible for attention control, planning and impulse inhibition, is still developing, she adds. “Repeated exposure to digital stimuli alters the balance between task-oriented and reward-oriented networks, which may affect the adolescent's autonomy to maintain attention on challenging activities.”

Sleep, emotions, stress

Screens interfere with the circadian rhythm: blue light delays the secretion of melatonin, and sleep becomes shallow. “Poor sleep affects emotional regulation, working memory and academic performance. At the same time, online social dynamics: likes, comments, feeds, amplify social comparisons, separation anxiety and the fear of missing out (FOMO). All of these can fuel emotional vulnerabilities“, confesses Geta Udrea.

According to his statements, variable rewards quickly become automatic habits. Notifications become signals that trigger the reflex to pick up the phone. Short videos provide micro-doses of novelty and surprise, keeping interest active. “In the long term, these mechanisms can reinforce behaviors that are difficult to moderate, especially in adolescence, where neural plasticity is high.”

The accumulated impact becomes visible: online time increases, tolerance for boredom decreases, difficulties in maintaining attention appear, and motivation for activities without immediate rewards (reading, sports, hobbies) decreases. In some cases, irritability, anxiety and heightened sensitivity to social feedback may occur.

How attention degrades

In clinical observation, says Geta Udrea, students react faster to digital stimuli, but lose their tolerance to monotonous tasks. Long readings, school projects, or conversations that require attendance become harder to sustain. The tendency is for tolerance to cognitive effort without immediate reward to decrease over weeks or months of intense exposure.

There is also an impulsivity component: correlations appear in the literature between heavy use of platforms and difficulties in making decisions, immediate reactions and decreased long-term planning. The relationship is bidirectional: impulsivity can attract platforms, and exposure can amplify impulsivity.

Social platforms become spaces of continuous evaluation. Teens expose themselves to feeds of constant idealization and performance, which can distort body image and perceptions of self-worth. The psychologist says that intense self-criticism, pressure to constantly perform and feelings of inadequacy often occur in the office. Accelerated social comparison can fuel cycles of anxiety and sadness.

Warning signs for parents

Early signs include prolonged time online without a clear purpose, irritability when the teen does not have access to the phone, loss of interest in offline activities, difficulty sleeping, and avoidance of school responsibilities. Stimulus escalation is a typical indicator: the need for more intense content to achieve the same level of satisfaction.

Geta Udrea recommends establishing a daily “digital window”: a clear, constant period during which access to devices is regulated. It works because it reduces exposure to immediate rewards, improves sleep, and increases availability for activities with deeper cognitive engagement, she says.

At the family level, modeling behavior is essential: parents should not check the phone during conversations and support offline alternatives, the specialist points out. In the school setting, teachers can rebuild effort tolerance through sustained tasks, regular breaks, and progressive feedback.

Although the studies are still heterogeneous, the psychologist observes a pattern: weeks for improvements in sleep and mood, months for increased ability to concentrate on non-digital tasks, a few months for the reconstruction of habits and autonomy.

Families typically see a stabilization of their emotional state and offline interests after consistent periods of moderation.

What's next with the integration of AI

Extreme personalization of feeds can intensify the dopamine cycle and time spent online. “Algorithms will deliver content increasingly tailored to the user's emotional profile, which increases the risk of 'emotional bubbles', hypervigilance and addiction to online validation. There are also risks to privacy and behavioral prediction, a sensitive area for autonomy and development,” she thinks.

Also, a study published in May 2025 in Nature Human Behavior (Fassi, Ferguson, Przybylski, Ford & Orben) analyzes nationally representative data from the UK, on ​​a sample of 3,340 adolescents between 11 and 19 years of age. The research compares how adolescents with a clinical diagnosis of anxiety, depression or conduct disorders use social platforms, compared to those without mental health problems.

The results show some consistent differences. Adolescents with “internalizing” disorders (anxiety, depression, rumination) spend more time online and are more likely to compare themselves to others. Feedback received in the digital environment (likes, comments) influences their emotional state more strongly, and satisfaction with online friendships is lower. At the same time, they have little control over the time they spend on the platforms and tend to reveal less of what they feel.

In contrast, adolescents with “externalizing” disorders (impulsivity, ADHD, conduct problems) differentiate less. The only clear trend observed in this group is greater time spent online, with no relevant changes in qualitative behaviors (social comparison, feedback monitoring, online authenticity).

The authors emphasize that the study does not establish causation, only associations, but it points to something important for mental health professionals: emotionally vulnerable teens process social platforms differently, more intensely and reactively. In practice, this may mean that interventions need to focus not only on “screen time”but on the way teenagers relate to the reactions, comparisons and dynamics of the platforms.