Heartsease (Viola tricolor), also known as wild pansy, has a long history in traditional herbal medicine, particularly in Europe. It has been used for various ailments, including respiratory issues such as bronchitis and coughs, largely due to its reputed anti-inflammatory and soothing properties. Historical herbal texts sometimes mention its use in mixtures for catarrhal conditions, which could include sinus congestion. However, there is little direct historical documentation specifically linking Heartsease to the treatment of sinus infections (sinusitis) as understood in modern medicine. Instead, its use is more broadly described for respiratory tract mucous membrane inflammation.

Scientifically, there is minimal evidence to support the use of Heartsease for sinus infections. Some laboratory studies suggest it has mild anti-inflammatory and antioxidant effects, likely due to compounds such as flavonoids and salicylates. Nevertheless, there are no robust clinical trials or scientific reviews substantiating its direct effectiveness against sinus infection or sinusitis specifically. As such, its use for this condition is primarily traditional, with very limited or indirect supporting evidence.