Kati Morton, a marriage and family therapist, recently went viral for her TikTok explanation of eldest-daughter syndrome. In the video she explains that the term is “not an official mental health diagnosis” but rather one coined to describe the experience of eldest daughters who “are responsible for more domestic labor than our siblings.”

The internet has been abuzz in the last few months as "eldest daughters," the oldest female siblings in families, have been collectively realizing that they have a lot in common.

Licensed marriage and family therapist Kati Morton broke down the eight signs of “eldest daughter syndrome” in a TikTok video that has been viewed over 6 million times.

NEW YORK TIMES - It all begins with an idea.In a TikTok video that has been watched more than 6 million times, Kati Morton, a licensed marriage and family therapist in Santa Monica, Calif., lists signs that she says can be indicative of “eldest daughter syndrome.”