Multiple choice general knowledge history What was the cause of death of Abraham Lincoln's mother? Malaria Tuberculosis Milk fever Yellow fever Reveal answer Fill a bubble to check yourself C Correct answer Explanation Nancy Hanks Lincoln died of milk sickness (also called milk fever) in 1818. This was caused by drinking milk from cows that had eaten the poisonous white snakeroot plant. It was a common cause of death in frontier areas at the time.