If it is minor thalassemia patients with normal hb and hct can have many symptoms, I hope Andy would like to explain the theory of why it happened. If in my case symptoms like often drowsiness and a bit dizziness occurs if my hb down to 10 or 11 it makes sense. Because oxygen in the blood is reduced. And I would often feel palpitations or shortness breath. Now I did not feel palpitations or shortness breath. Only frequent drowsiness and a bit dizziness, plus sometimes mental fog (difficulty concentrating, forgetfulness, confusion). I wish Andy would like to explain to me the theory and the relationship between hb and hct were normal with symptoms such as frequent drowsiness, dizziness, and mental fog. That is, if indeed there is a connection between the two. I am very grateful to Andy if he would explain this to me.