Teucrium marum, commonly known as cat thyme, has a history of use in traditional European herbal medicine, particularly in the Mediterranean region. Historically, it has been employed for various respiratory complaints, including to support the sinuses, as part of remedies for catarrh, rhinitis, and nasal congestion. The rationale for its use lies in its aromatic, pungent properties, which were believed to help clear nasal passages and promote mucus drainage. Some older herbal texts, such as those by Nicholas Culpeper, mention Teucrium marum for "obstructions of the head" and "stuffed noses." However, these uses are based on empirical observations and the doctrine of signatures rather than controlled scientific studies.

There is a lack of modern scientific evidence to validate the efficacy of Teucrium marum for sinus support. No clinical trials or pharmacological studies have demonstrated its effectiveness for sinus health, nor is it widely referenced in contemporary phytotherapy literature for this purpose. Most information about its use pertains to traditional herbalism rather than evidence-based medicine. In summary, while Teucrium marum has a traditional reputation for supporting the sinuses, this is not substantiated by modern scientific research.