Patient's question:
Hello,My daughter is 19 months old, and her eyes often tear up without her realizing it. What could be the reason?
Follow-up question: Hello, there are no other symptoms. It's just like when she watches an emotional movie, tears well up in her eyes without her consciously doing so.
Doctor's answer:
Human tears are secreted by the lacrimal glands, among which the main lacrimal gland is a reflex secretor. When stimulated by factors such as pain, cold, or significant emotional changes, the secretion of tears increases. Therefore, when exposed to cold wind, the main lacrimal gland can reflexively secrete excessively. At the same time, the skin and muscles around the face and orbit contract under cold stimulation, compressing the lacrimal ducts. The outflow of tears from the nasal cavity is obstructed, forcing them to flow out from the corners of the eyes, resulting in tears streaming down.