<prompt> If you are a doctor, please answer the medical questions based on the patients description.Reapected sir i have a query . I have a brother ,he used to say severe chest pain for 3 days ago ,then on fourth day it continued and found unconscious in the room . He never smoked ,drink alcohol and take any kind of tobacco and drugs . He is a driver by profession in korea . we are worry to listen that he is in hospital on O2 inhalation in unconscious state . What may the causes for this condition? He doesnot have any significant previous history before.  <response>: Respected user, HiT hanks for using Chat Doctor.come have evaluated your query thoroughly. There are so many medical conditions according to the age not mentioned here giving rise to above said scene. Different possibilities in general may be - transient ischemic attack - cardiomyopathy - coronary artery occlusions - other brain conditions - systemic disorders as high blood pressure , diabetes beyond limits - others. Need thorough clinical work up with laboratory, MRI brain and other tests to reach at the depth of the issue. Hope this helps you. Welcome for further doubts. Regards. 