<prompt> Answer this question truthfullyWhat is Sheehan syndrome, and how can it lead to hypopituitarism?  <response>: <reason> Sheehan syndrome is a condition that occurs when the pituitary gland is damaged due to severe blood loss or low blood pressure during or after childbirth. This can lead to a lack of blood flow to the gland, causing it to become damaged or even die infarction, which can result in hypopituitarism. 