Passionflower (Passiflora incarnata) has a long history of traditional use for supporting emotional well-being, particularly in addressing symptoms such as nervousness, restlessness, and mild anxiety—states often associated with emotional sensitivity. Indigenous peoples of the Americas and later European herbalists employed passionflower as a calming remedy, utilizing its aerial parts in teas or tinctures to soothe the nerves and promote relaxation. The plant gained popularity in the 19th and early 20th centuries as a natural sedative and was included in several pharmacopeias as a treatment for "nervous disorders."

While passionflower is not specifically referenced in traditional sources as a remedy for "emotional sensitivity" per se, its broad use for nervous states and emotional distress underlies its application for this modern term. The calming effects are thought to be related to modulation of gamma-aminobutyric acid (GABA) in the brain, although robust scientific validation for this mechanism or for its effect on emotional sensitivity specifically is limited. Some clinical studies suggest passionflower may help reduce symptoms of anxiety and improve sleep quality, which can indirectly support people experiencing heightened emotional responses. However, these studies are generally small, and more research is needed.

In summary, the use of passionflower for emotional sensitivity is primarily justified by tradition, with moderate supportive evidence for its general calming effects, but limited direct scientific investigation into its effects on emotional sensitivity as a distinct condition.