The main reason is that your qi and blood are deficient, your blood metabolism slows down, and low temperature causes blood vessels to contract, which weakens your blood return ability. Drink plenty of boiled water and pay attention to rest and sleep! Make up some yam, jujube, lotus seed, lily, fungus, pear, carrot, sesame and so on! Diuretic laxative, heat and detoxification! In order to enhance physical fitness, do more aerobic exercise, such as mountain climbing, cycling, tai chi, dancing, walking and deep breathing! Usually, you should exercise more to strengthen your physique, which consumes too much energy! However, don't exercise too hard before going to bed. Drink a glass of milk before going to bed, which can calm your mind! Or drink a small amount of red wine to soften blood vessels and promote sleep! Stay optimistic! Just relax。 Better nutrition! Don't watch exciting or scary movies or books before going to bed! Maintain personal hygiene and good habits before going to bed! Don't think about it during the day! One is the lack of certain vitamins (usually B vitamins B2) in the body, and the other is excessive internal heat or toxins caused by fatigue, which may be a cold, or you are weak and get angry, lack of exercise, and poor sleep quality! Too angry! Or you may be too depressed, use your voice too much, your vocal cords are damaged, you smoke too much, you spend too much time online, you are under too much pressure, and your physical strength will decline. In addition, when the temperature and humidity change greatly, your physical strength will decrease and your resistance will also decrease. The most common symptoms are a series of respiratory infections such as cold, cough, dry mouth, stuffy nose, bitter taste, sore throat, fever, mild cold, general aches and headaches.