Placental Abruption: This condition, where the placenta separates from the uterus, is a common cause of sudden intrauterine fetal death due to the interruption of fetal oxygenation and nutrition.

Umbilical Cord Accidents: Issues such as umbilical cord prolapse, torsion, or compression can lead to sudden fetal death by compromising fetal circulation.
Maternal Hypertension or Preeclampsia: These conditions can lead to placental insufficiency and fetal distress, potentially resulting in intrauterine death.
Fetal Growth Restriction: Due to placental insufficiency, this condition increases the risk of intrauterine fetal death, especially if not properly managed.
Intrauterine Infections: Certain infections can cause inflammation and damage to the placenta, leading to fetal death.

Maternal Trauma: Physical trauma to the abdomen during pregnancy can cause placental abruption or direct fetal injury, leading to intrauterine death.
Thrombophilias: Maternal thrombophilic disorders can increase the risk of placental thrombosis and infarction, potentially causing fetal death.
Amniotic Fluid Embolism: Although rare, this condition is often fatal for both the mother and the fetus and should be considered in cases of sudden intrauterine death.

Fetal Congenital Anomalies: Certain severe congenital anomalies can increase the risk of intrauterine death, though they are less common causes compared to other factors.
Maternal Autoimmune Disorders: Conditions like lupus can increase the risk of fetal loss due to placental inflammation and insufficiency.
Uterine Rupture: Though rare, uterine rupture can cause sudden intrauterine fetal death, especially in women with a history of uterine surgery.