Is it permissible to ligate the fallopian tubes after the fourth cesarean section, given the presence of illnesses (hypertension, vitamin D deficiency, knee inflammation), weight gain due to contraceptive pills, and the desire not to have more children in the future?

It is not permissible to proceed with the complete severing of the cord by means of sterilization, unless the pregnancy poses a danger to the mother's life, or she suffers unbearable illnesses and pains because of it, and there are no temporary birth control methods suitable for her.