Hemoglobin 165g/L is a little on the high side, but basically within the normal range. The normal value of hemoglobin is different for different groups of people. Normally, hemoglobin is 120-160g/L for adult men, 110-150g/L for adult women, and 120-140g/L for children. Newborns have a slightly higher normal hemoglobin of 180-190g/L, so generally speaking, hemoglobin of 165g/L is a little on the high side. Although it is a bit high, it does not have much clinical significance, and may be high due to physiological factors, such as residents of highland areas, newborns and so on. But also need to pay attention to their own situation, timely review, to avoid hemoglobin persistently high, if persistently high, need to consider whether there are pathological factors. In normal life, you can carry out aerobic physical exercise in moderation to enhance physical fitness, and drink an appropriate amount of water to avoid dehydration. If you experience any discomfort, you should seek medical attention as soon as possible.