Crying: listener question

Is crying just part of selfing or an indication of or reaction to selfing. If we speak about something or hear something or see something and tears arise .. is this a sign of somehting healing and being let go of or a sign that we are selfing and to 'stop it'. I have often wondered what the bodies mechanism of producing tears serves .. tears can come in times of sadness or joy and  maybe its all just a way of the system regulating itself and to 'get us back into body connection and presence'