Zhang Meng had a breakdown last December. The 20-year-old found herself sobbing on the stairs of her dorm, driven to despair by repeated COVID-19 lockdowns at her university campus in Beijing.

The lockdowns had meant she was mostly confined to her room and unable to meet up with friends. There were also strict curbs on when she could visit the canteen or take a shower. Describing herself as someone who craves in-person social interaction, Zhang said the restrictions had "removed the safety net that was holding me up and I felt like my whole being was falling down."

That month, she was diagnosed with major depression and anxiety.