Why does sadness cause us to shed tears?

A: Sadness can sometimes overwhelm the body to the point that it produces tears. These tears, called emotional tears, are different from the ones that keep our eyes moist or flush out irritants like dust or vapours from cut onions. They are triggered by deep activity in the brain’s emotion-processing centres, especially the hypothalamus, which links feelings to physical responses. When a person feels grief or despair, this region activates the lacrimal glands, which release more tears.

One explanation is that crying helps the body manage stress. Studies have shown that emotional tears may contain higher amounts of stress-related hormones, so shedding them could partly restore balance. The act of crying also activates the parasympathetic nervous system, which slows the heart and promotes relaxation, leaving people calmer afterwards.

Crying also has a strong social purpose. Tears signal that someone is in distress and can invite care, comfort or understanding from people around them. Unlike loud sobs, visible tears can be a silent yet reliable cue that a person is vulnerable. In this way, crying in sadness functions both as a self-soothing mechanism and as a way to build social empathy.