We divide the discharge of tears from the eyes into two situations: lacrimation and epiphora.
Lacrimation occurs when there is an increased secretion of tears that cannot be drained properly, causing the tears to flow out of the eyes. Epiphora, on the other hand, refers to the normal amount of tear secretion but with poor drainage, resulting in tears flowing out of the eyes.
As for the specific causes of tearing, it may need to be determined according to the actual situation.

If it's tearing in the wind, this is a reflexive increase in tear secretion caused by external stimuli, which is a normal phenomenon.
If there is a local inflammatory reaction that stimulates an increase in tear secretion, it can also cause tearing.

If there is no inflammatory reaction and tears flow out even without any stimulation indoors, it belongs to epiphora, and the main cause should be a narrow tear duct.