<prompt> Answer this question truthfullyWhat causes Tetralogy of Fallot?  <response>: <reason> Common causes of tetralogy of Fallot may include:Alcoholism in the mother Diabetes Pregnancy after the age of 40 Rubella or other viral illnesses during pregnancy Phenylketonuria PKU in the mother Fetal hydantoin syndrome Fetal carbamazepine syndromeLess common causes of tetralogy of Fallot may include:Clomifene Poor nutrition during pregnancyGenetic causes of tetralogy of Fallot may include:There is a high incidence of chromosomal disorders in children with tetralogy of Fallot. Tetralogy of Fallot is associated with:Down syndrome DiGeorge syndrome a 22q11.2 deletion, a condition associated with heart defects, hypocalcemia, and immune deficiency A gene polymorphism at the methylenetetrahydrofolate reductase MTHFR region has been associated with tetralogy of Fallot. 