There are many factors that can cause fast blood flow, usually seen in emotional excitement, strenuous exercise, blood vessel narrowing or spasm and other factors will lead to faster blood flow. When the accelerated blood flow leads to shortness of breath, dizziness and other accompanying symptoms, it is recommended to consult a doctor in time. 1, emotional excitement: blood flow is usually fluctuating with the heart’s beat, when people’s emotions are in a state of excitement, the heart pumping frequency will be correspondingly faster, and at this time, the corresponding speed of the blood flow will be faster; 2, strenuous exercise: after strenuous exercise, may cause the body’s metabolism to accelerate the increase in the volume of return blood, resulting in faster blood flow, which is usually a normal physiological phenomenon. This is usually a normal physiological phenomenon, and the symptoms can be relieved by themselves after sufficient rest; 3, vascular stenosis or spasm: this is an organic change, generally due to drinking, smoking, high blood fat, high blood pressure, etc., resulting in vascular sclerosis, vascular plaque, or even, vascular clogging, etc., which leads to the lumen of the blood vessels become narrow. Under normal circumstances the blood flow through a unit of blood vessels is relatively fixed, and after the narrowing of blood vessels, the speed of blood flow will become faster accordingly. People who do not sleep well, get cold or suffer from migraines, upper respiratory tract infections, etc. may experience vasospasm, and when the blood vessels spasm, the blood flow rate may also increase.