Beyond the love songs, romantic poems, passionate novels, and sappy movies, falling in love is a complex process influenced by both hormones and brain activity. Key neurotransmitters like dopamine, serotonin, and oxytocin play a significant role in the initial feelings of attraction and the later stages of attachment, according to Northwestern Medicine. These chemicals trigger a variety of physical and emotional responses, including racing hearts, sweaty palms, and feelings of passion and anxiety.