<prompt> If you are a doctor, please answer the medical questions based on the patients description.I am 66.jUST DIAGNOSED WITH ET.DR AT UAB in Alabama told me AVERAGE life expectancy is 4 years.That seems a little pessimistic from what i read.Any thoughts?I am very active and dont smoke.I do Crossfit 3 times per week.Also i have felt somewhat fatigued .Is that from et or hydroxy treatment.Thanks Bobby Boone  <response>: Dear Bobby, I dont know with which reference your doctor is telling such low life expectancy. Most of the ET patients have near normal lifespan. Only those who have thrombosis or transformation of ET to acute leukemia have reduced survival. This is the reference: continue your daily physical activities without any restriction. I feel your fatigue is more psychological. If your hemoglobin level is more than 10gmDL, then there is no need to worry about fatigue. Please get your blood tested for hemoglobin level. Hope I have answered your question. If you have any further questions I will be happy to help. With regards, 