Buddha's Hand (Citrus medica var. sarcodactylis) has a long history of use in traditional Chinese medicine (TCM) and other Asian medical systems. In TCM, it is known as "fo shou" and is prized for its aromatic rind and volatile oils. Traditionally, it is used to regulate qi (energy), relieve pain, resolve phlegm, and alleviate coughs and congestion. Because of its aromatic and expectorant properties, Buddha's Hand is sometimes employed in herbal formulas intended to support respiratory health, including relief of sinus congestion and related symptoms. However, there is little to no modern clinical research specifically validating its effectiveness for treating sinus infections (sinusitis). Some laboratory studies suggest that the essential oils of Buddha's Hand exhibit antimicrobial and anti-inflammatory actions, but these findings are preliminary and not specific to sinus infections in humans. Thus, its use for sinusitis is based primarily on traditional practice rather than robust scientific evidence. The overall quality and quantity of supporting evidence is low, and it should not be considered a proven or primary treatment for sinus infection.