She was Rhesus Negative and it basically meant that with her blood she was poisining her baby.
Season Eight Still on a vengeful mission, Lana decided to cut Lex off from his loyal follower,.
Lex quietly accepted the dissolution of their marriage and Lana had no contact with him for a long time, although she kept a close eye on him in the hope of exposing him to the world.
Not only was he allowing her to feel all of that pain, but when she was asking for her records to know what happened and he denied her.
She had been a smoker all her life.
When Lana told Clark that she had discussed their relationship with Lex, he was surprised and seemed a little angry, as he had just had an argument with Lex when Clark thought he was still researching him.
The filming of this picture began only a few days after her suicide attempt.
What further troubled Lex throughout his life was the callousness of his father.