Heartstrings are the deepest feelings of love, sympathy, or tenderness in a person. When something tugs at your heartstrings, it moves you emotionally in a powerful way. A story about a lost dog finding its way home might tug at your heartstrings. So might seeing your little sister learn to ride a bike after trying so hard, or watching your grandfather tear up at your piano recital.

The word comes from an old belief that tendons or nerves in the heart controlled emotions. While we now know emotions happen in the brain, the metaphor stuck because it perfectly captures how strong feelings can feel almost physical, like something pulling inside your chest.

People often use this word when describing emotional moments in books or movies. A filmmaker might try to pull at the heartstrings of the audience with a touching scene. The phrase suggests genuine emotion rather than fake sentimentality. When your mom says the handmade card you gave her for her birthday tugged at her heartstrings, she means it touched her in a way that felt deep and real.