"Hereditary" is widely regarded as both scary and disturbing. The film blends psychological horror with supernatural elements, exploring themes of grief, trauma, and family secrets. Its unsettling atmosphere, intense performances—particularly by Toni Collette—and shocking moments contribute to its effectiveness in creating fear. Many viewers find its slow-building tension and disturbing imagery to be profoundly unsettling, making it a standout in the horror genre. Overall, it leaves a lasting impact, often lingering in the minds of those who watch it.

"Hereditary" explores themes of familial legacy, trauma, and the inescapable nature of inherited emotional and psychological burdens. The title reflects how the characters are haunted by their ancestry, particularly the influence of their deceased matriarch, whose dark secrets and mental illness affect future generations. The film delves into the idea that certain traits and traumas can be passed down, creating a cycle of suffering. Overall, it highlights the complexities of family dynamics and the profound impact of one's lineage on identity and fate.

In "Hereditary," Annie Graham, portrayed by Toni Collette, exhibits signs that suggest she may be dealing with a form of mental illness, primarily characterized by anxiety and grief following the traumatic events in her family. Throughout the film, her mental state deteriorates, leading to erratic behavior and delusions. The film also explores themes of hereditary trauma and the impact of familial mental illness, suggesting that Annie's struggles may be influenced by her family's dark history. However, the film blurs the lines between mental illness and supernatural elements.

"Hereditary" is a fictional horror film directed by Ari Aster, and while it is not based on a true story, it explores themes of grief, family trauma, and the legacy of mental illness. The film follows the Graham family as they deal with the death of their secretive grandmother and uncover dark secrets about their ancestry. The narrative delves into the psychological and supernatural elements, reflecting Aster's interest in how family dynamics and inherited trauma can manifest in disturbing ways.