Sneezing is caused by physiological reasons such as stimulation of the nasal mucosa, or pathological reasons such as allergies, colds and rhinitis.
1. Physiological reasons: Sneezing is a defensive reflex action caused by stimulation of the nasal mucosa. Generally, it is caused by inhalation of irritating chemical particles and dust and other suspended substances, which triggers the sneezing reflex and produces the coherent action of sneezing. The performance is a sharp inhalation, and then quickly out of the nostrils.
2. Pathologic causes: common causes of sneezing include: colds, vasomotor rhinitis or allergic rhinitis, often triggered by inflammatory factors and secretion stimulation.
Always sneezing needs timely medical treatment. Frequent sneezing should be examined in the nasal cavity, and allergen testing should be done if necessary to make a clear diagnosis.