Among teenagers, some popular online topics or challenges may trigger the urge to self-harm. These topics usually involve issues such as stress, anxiety, and self-image. Here are some online topics or challenges that may trigger such behaviors: 1. **Self-harm challenges**: Challenges that encourage self-harm may appear on some social media platforms, and teenagers may be influenced to imitate them. 2. **“Perfect” image and body anxiety**: The idealized body and lifestyle displayed on social media may cause teenagers to feel inferior, causing them to put pressure on themselves and even try to harm themselves. 3. **“Depression” or “Sadness” Challenge**: Some challenges on social media may ask teenagers to share their depression or negative emotions, which may trigger more negative emotions and self-harm behaviors. 4. **Cyberbullying**: Cyberbullying and bullying can cause great emotional pain to teenagers and may cause them to have thoughts of self-harm. 5. **Loneliness and social isolation**: The high connectivity of social media sometimes exacerbates the loneliness of teenagers, causing them to seek extreme ways of self-expression. 6. **Challenges to take “life-threatening” photos**: Some challenges may encourage people to participate in dangerous activities. Although they are not directly aimed at self-harm, they may indirectly trigger teenagers to engage in self-harm behaviors. 7. **The prevalence of mental health topics**: While discussing mental health is important, irresponsible discussions may make adolescents with mental problems feel isolated and helpless, increasing the risk of self-harm. Guardians, educators, and mental health professionals should pay attention to adolescents' online activities and provide support and correct information to help them cope with possible negative impacts.