I am a 72-yr-old male. My face almost every day gets hot (but not sweaty or obviously flushed) for an hour or more especially in the evenings. Results from a urine test for 5-HIAA, plus chest Xray and abdominal ultrasound and CT scan, do not find anything negative (except in lungs some emphysema). My internist now says it could be high blood pressure, others say this is unlikely as a cause. (My blood pressure, with medication, is normal when tested by a doctor; I can t get a device to work when I test it at home. ) I have not really found a serious cause for this condition, but I am afraid there is one and not sure what to do next or what kind of a doctor could best address my concerns..