Mallow (Malva sylvestris) has a long history of use in traditional herbal medicine, particularly in Europe and parts of Asia. Historically, its leaves and flowers have been valued for their demulcent (soothing) and anti-inflammatory properties, and it has been applied to a variety of ailments, including sore throat, cough, and irritations of the mucous membranes. In the context of sinus headaches, mallow has sometimes been recommended in folk medicine for its purported ability to soothe inflamed mucous membranes in the nasal passages, which may indirectly offer some relief from symptoms associated with sinus congestion and headaches. However, this use is based on traditional knowledge rather than rigorous scientific evaluation.

Currently, there is very limited scientific evidence to directly support the use of mallow for sinus headaches. Most modern research has focused on its general anti-inflammatory and mucoprotective actions, not specifically on sinusitis or headache relief. As a result, its use for headache (sinus) is best characterized as traditional, with a low level of supporting evidence. Any benefits are likely to be mild and related to its general soothing effects on mucous membranes rather than direct analgesic or decongestant action. Individuals seeking treatment for sinus headaches should consult healthcare professionals, as more effective and evidence-based therapies are available.