Hello, my 20-year-old friend I am a doctor. According to your situation, I think so. There are many reasons for hypertension, among which genetic factors and environmental factors occupy a very important position. Your grandmother has high blood pressure. Although it can't 100% prove that your hypertension is inherited from your grandmother, it is indeed a risk factor, but you are too young, even if you have a family history, you won't inherit it to you so early, but you are younger now and can't completely deny it. Judging from your medical history, I think environmental factors have played a great role in you. Surfing the Internet every day has nothing to do with hypertension, but your physical exercise is almost zero and it has something to do with hypertension. Without exercise, fat will be deposited, which is an important factor of all cardiovascular and cerebrovascular diseases. High blood pressure 140, low blood pressure 90 can really be diagnosed as hypertension, especially since you are so young, you need to attach great importance to it. My suggestion is: don't blindly use drugs first, adjust your diet and living habits, and be sure to exercise regularly and live a regular life for the health of the rest of your life. Exercise doesn't need to be too intense, but too intense physical exercise will be counterproductive. Jogging, swimming, walking and ball games are all acceptable. Jogging should last for more than half an hour, so as to have a good effect. Eat more fruits and vegetables, have a light diet and eat less salt to ensure sleep and a happy mood. You can also buy some recipes about health preservation in the bookstore, because there are many dishes that can lower blood pressure, so I won't list them here. Just adjust your living habits and stick to it for about half a year. If your blood pressure hasn't come down, you should take medicine according to your specific situation, otherwise a series of complications may occur. I have told you so much in very common language, hoping to help you.