Peppermint leaf (Mentha × piperita) has a longstanding history of traditional use for the relief of headaches, including those associated with sinus congestion. In traditional herbal medicine, peppermint has been valued for its cooling sensation and ability to relieve tension and discomfort, which has led to its use for headache relief. The main active component, menthol, is believed to produce a soothing effect when applied topically or inhaled, potentially helping to ease headache symptoms. However, most of the scientific evidence supporting peppermint for headaches focuses on peppermint oil, particularly in topical applications for tension-type headaches. There is limited direct scientific research specifically evaluating peppermint leaf or peppermint tea for sinus headaches. The traditional use is often based on empirical evidence and centuries of anecdotal reports rather than rigorous clinical trials. For sinus-related headaches, peppermint is sometimes used in inhalations or teas to help open the nasal passages through its menthol content, which can provide a sensation of relief. Nonetheless, the majority of clinical evidence for headache relief is associated with concentrated peppermint oil applied to the temples rather than the use of peppermint leaf itself. Therefore, while traditional use exists and is widespread, scientific validation for peppermint leaf’s effectiveness for sinus headaches remains modest.