Q:So sterilization is immoral? What about if a couple decides they don't want any more kids (for whatever reasons) and one of them gets sterilized? How is not wanting more kids wrong? And if the woman has a medical condition that would make pregnancy dangerous for her and likely kill her? How about getting a hysterectomy because of a family history of uterine cancer?
Sterilization is immoral because it completely, permanently, and unnaturally closes the pro-creation aspect of sex (that is if the goal is to keep from having children, rather than a legitimate medical reason). There is nothing wrong with not wanting any more children, but there is a moral and chaste way of going about this. One is not having sex. Another is NFP.
If a woman has a condition that would make pregnancy dangerous, she probably shouldn’t be engaging in any activities that would give her the possibility of getting pregnant (she shouldn’t have sex because sex gets women pregnant).
If a woman has a family history of uterine cancer she should be screened for such a cancer and not just jump the gun with a hysterectomy. Getting the uterus removed causes major health problems to women when done too early in life, even for life threatening illnesses. The hormonal changes causes many physical difficulties and dangers to the health. She would be on hormonal medication and prolonged use could cause health complications or even death.