August 3, 2026, 12:08 pm | Read time: 3 minutes
TikTok, Instagram, and other platforms are a staple in the daily lives of many teenagers. But what happens when usage becomes excessive? A long-term study from the U.S. now suggests that problematic social media use could be linked to later ADHD-like symptoms—especially among male teenagers.
Many teenagers spend hours daily on social networks
A German survey shows how strongly social media shapes the daily lives of young people: 69 percent of 14- to 20-year-olds spend more than two hours daily on platforms such as TikTok or Instagram. Twenty-seven percent even spend at least five hours a day.1
Researchers from the University of California in San Francisco followed more than 11,000 teenagers over five years for a study. The participants were about 12 years old at the start of the study. The result: In phases when teenagers were particularly attached to their smartphones, parents reported more frequently the following year about symptoms associated with ADHD. These included concentration problems, inattention, and impulsive behavior.2
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It’s not just the duration that matters
According to the researchers, it wasn’t just the time spent on social networks that played a role. What was crucial was whether teenagers developed problematic usage patterns. The study examined behaviors such as constantly thinking about social media, the urge to be online all the time, unsuccessful attempts to limit usage, and stress or restlessness when access to these platforms was unavailable. If teenagers exhibited these behaviors more frequently, parents reported an increase in ADHD-like symptoms later on.
The observed connection was particularly pronounced between the ages of 14 and 16. It was especially evident among boys. For them, problematic social media use more often preceded a later increase in ADHD symptoms. The researchers did not find a corresponding effect in girls.
Why social media can be problematic for the teenage brain
Social networks rely on continuous reward stimuli. Likes, hearts, and immediate feedback can repeatedly trigger small reward effects in the brain.
Especially between the ages of 12 and 18, the brain is still in an intense developmental phase. If teenagers are constantly exposed to such stimuli, changes in certain brain areas could result. Possible effects include concentration and attention problems, depression, irritability, and sleep disturbances.
According to experts, MRI scans can detect changes in areas related to the release of adrenaline and dopamine, as well as impulse control and reflection ability. Similar changes are also observed in people with ADHD, whose brain networks for reward processing and impulse control are particularly sensitive to such stimuli.
However, the study does not prove that TikTok, Instagram, or other social networks cause ADHD or that affected teenagers are more likely to be diagnosed with ADHD later. It merely shows a connection between problematic social media consumption and later emerging ADHD-like symptoms.