Cold and flu are mostly caused by deficiency of yin and blood in the body, and the deficiency of yin and blood in the body, which is not able to resist the evils. If you have been sick for a long time and have suffered from fatigue and exhaustion for many years, your body will be weak and your yin and blood will be insufficient, and you will not be able to resist the attack of wind and cold, and then you will have frequent and repeated colds and flu. Yin and blood deficiency, unable to restrain yang qi, there will be yang qi hyper in the upper, which will lead to the corners of the mouth erosion, tongue blistering, dry and itchy pharynx, etc. Yin deficiency and fire (deficiency of yin and essence in the body, the emergence of hyperactive deficiency fire) of the symptom, commonly known as on fire. On fire easy to catch a cold clinical yin and blood deficiency is the most common, but there are also evil long ambush in the body, waiting for the opportunity to lead to. Daily if you see, should be integrated with a variety of symptoms such as analysis and judgment, if necessary, should be disposed of in a timely manner, do not arbitrarily dispose of or unauthorized long-term use of cold drugs for treatment.