What hormone is responsible for making a person sad?

No single hormone is solely responsible for making a person sad. Emotions, including sadness, are often the result of a complex interplay of various factors such as genetics, neurotransmitters, life experiences, and psychological well-being. Some hormones and neurotransmitters that may influence mood regulation include serotonin, dopamine, oxytocin, and endorphins. However, the experience of sadness is not necessarily caused by a specific hormonal imbalance.