A team of researchers from the Chinese University of Hong Kong and other Chinese universities reviewed 58 studies covering nearly 97,000 people to answer a question worrying millions of parents and users alike: does short-form video like TikTok, Instagram Reels or YouTube Shorts harm mental health? The answer, published in the Journal of Medical Internet Research, comes with a nuance that changes the conversation.
The link to anxiety, stress and depression is real, though moderate. Pooling data from 53 studies covering people aged 12 to 70, short-form video use was linked to more depression, more anxiety, more stress, more loneliness and more boredom. None of these associations is large in statistical terms, but all are consistent: the more short-form video a person consumes, generally, the worse they score on these measures.
But the study’s central finding is something else: it’s not time, it’s dependency. Researchers split participants into two groups based on how their use was measured: routine use, meaning minutes or hours per day, and problematic use, meaning addiction, dependency, or an inability to control the habit. The difference between the two groups was enormous. Problematic use showed a clear, moderate relationship with depression, anxiety, stress, loneliness and boredom. Routine use, by contrast, showed almost no relationship with anything, and in several analyses that weak relationship disappeared entirely once a single study was removed from the sample, a sign it isn’t a robust result.
With anxiety, the contrast was even more striking. Problematic use was linked to a moderate increase in anxiety. Routine use, simply spending time watching short videos without a pattern of dependency, showed a negative, non-significant relationship, meaning no evidence that watching short videos occasionally increases anxiety.
Well-being only suffers in those who can’t stop. Looking at all users together, there was no significant relationship between watching short videos and overall well-being or positive emotions. That relationship only appeared, and negatively, in the problematic-use group: people who couldn’t control their consumption did show lower subjective well-being than everyone else.
Short-form video seems to weigh more heavily than traditional social media. Comparing their results with earlier meta-analyses on problematic phone, internet or general social media use, the authors found the relationship between problematic short-video use and mental health was stronger than for those other categories. Their hypothesis is that the format itself, extremely brief videos recommended by an algorithm that learns from every second watched, creates a different kind of hook than other screens.
The researchers point to three possible mechanisms. First, the recommendation algorithm itself, which creates a kind of increasingly personalized content bubble that can intensify feelings of isolation. Second, the format itself, so short and with such rapid cuts, which could fragment attention span and overload cognitive processing. Third, the fact that more and more users move from watching content to creating it, with the added pressure of views and ad revenue, something earlier generations of social media users didn’t experience with the same intensity.
This is correlation, not a controlled experiment, and that matters. Almost all the included studies are cross-sectional, meaning they capture participants at a single point in time, unable to establish what came first. The authors themselves suggest the relationship could run in several directions at once: people with anxiety or boredom might turn to short videos as a form of escape, problematic use might generate anxiety by displacing sleep or fueling social comparison, or both could feed into each other over time. Additionally, 55 of the 58 studies were conducted in China, so more research in other countries is needed before treating these findings as universal.
The practical takeaway, according to the authors themselves, isn’t to stop using TikTok or Instagram Reels. It’s to pay attention to signs of dependency: difficulty stopping, discomfort when the app isn’t accessible, or use that displaces other activities. Simply watching short videos now and then, without that pattern of compulsion, showed no clear link to worse mental health in this analysis.
About this article. This piece is based on the scientific study “Association Between Short-Form Video Use and Mental Health: Systematic Review and Meta-Analysis,” by Di Tang, Xin Zhang, Pengpeng Gou, Jie Feng, Rui Hu and Kim-wai Raymond Sum, published in 2026 in the Journal of Medical Internet Research (JMIR), open access under a CC BY license. DOI: 10.2196/82503.
