@hhereford, welcome to Connect. It is such a shock to be diagnosed with endometrial cancer out of the blue. Not even the experts know why it happens or what cause endometrial cancer. There are risk factors that may help explain it https://www.mayoclinic.org/diseases-conditions/endometrial-cancer/symptoms-causes/syc-20352461

Do you know what stage the cancer is? May I ask are you pre or post menopausal? What questions do you have?