<s>[INST] Hi, I have had shortness of breath upon simple exertion. My blood pressure is normal and lung capacity is good. All my blood tests show no irregularity but I am fatigued all the time in spite of adequate sleep. Could I be experiencing a narrowing in a vital blood vessel? [/INST] Hello,I have gone through your query.Thanks for using HCM.Usually exertional symptoms may be due to deacreased blood supply to heart.shortness of breath on exertion may be angina equivalent.if you are not anemic  then you should get your ECG and if ECG is normal ,then you should get exercise stress testing done to rule out  anginal pain.My best wishesDr.Rajesh Teli,MD </s>