These are the tears produced in response to that strong emotion you may experience from stress, pleasure, anger, sadness and suffering to indeed, physical pain. Psychic tears even contain a natural painkiller, called leucine enkephalin – perhaps, part of the reason why you might feel better after a good cry!
People generally cry more than others becuase they are more emotional.
People may cry a lot because of something that they may be going through or maybe they just get sad over stuff i would advice you to please look up this in google it will tell you more because i really do not know but i may know that sometimes its because they are going through something.