tears

[Ju]

How do we describe one is easily tearing as the tear gland naturally caused him easily tearing compared to others. It's not an illness.

Thank you

[JMurray]

Ju.
The most obvious common term that specifically refers to crying is "a crybaby". There are many others that mean someone who may cry easily because of what other people might perceive as weakness: wimp, sook, sissy, sniveller, etc. These are often used to unpleasantly criticize somebody who might just be, by their nature, sensitive, sentimental or easily upset.

not a teacher

[probus]

For an expression that is not pejorative you can say someone is prone to weeping or prone to tears.

[5jj]

You might say that their eyes frequently well up.

[Rover_KE]

Emotional people tear up easily.

RTover

[probus]

Is that why they are so often "all torn up?"

[Ouisch]

In AmE, someone who is very easily moved to tears might say it just like that. Or they might apologize when the tears start to flow while watching a movie and say "I'm sorry, sometimes I'm very emotional." Other people might say "The slightest thing can make me cry." It depends upon the situation.

[Ju]

Is that why they are so often "all torn up?"

What does it mean of all torn up, please?

Thank you.

[Ju]

You might say that their eyes frequently well up.

What does it mean of well up, please?

Thank you.

[Ju]

In AmE, someone who is very easily moved to tears might say it just like that. Or they might apologize when the tears start to flow while watching a movie and say "I'm sorry, sometimes I'm very emotional." Other people might say "The slightest thing can make me cry." It depends upon the situation.

Sorry, what I mean is one who's not easily crys due to emotion, but the tears flow strongly even just making a single yawn.

Thank you.