"The Yellow Emperor's Neijing" talks about the rule of "nourishing yang in spring and summer, and nourishing yin in autumn and winter", teaching people to adapt to the changes of the seasons and adjust their lifestyles and eating habits to maintain the balance of yin and yang. The four seasons check and balance each other, interpreting the body's ability to resist external evils in the change of seasons. 
Winter hurts the cold, and spring will be sick and warm.
In the cold winter, the body is susceptible to the invasion of cold evil, and in the spring, it may cause temperature sickness。Fever is actually a disease characterized by high fever, and its course is rapid, spreads rapidly, and the disease is severe. The root cause of this lies in the intrusion of external evils, especially caused by warm evil spirits. So, why does cold injury in winter lead to fever in spring?
Among them, Ni Haixia said, "Winter hurts the cold, and spring will be sick and warm" is based on the "Yellow Emperor's Neijing, Suwen, and Four Tempering Spirits" about ".The qi of the four seasons, each has a victory or defeat, with its victory, attack its invincible, then the void suffers eviltheory.
The four seasons are the four evil spirits of wind, heat, humidity and cold, which have different strengths and weaknesses and effects in different seasons.
Spring is the solar term of the wind, and the wind evil is prosperous, which is easy to invade the human body, resulting in the retention of evil qi and causing the symptoms of cave discharge.
Summer is a time of summer, when the summer evil is blazing, easy to invade the human body, damage the yang energy, and cause the depletion of the fluid, which is manifested as the heat of the body fluid.
Autumn is a wet solar term, and the dampness is heavy and turbid, which is easy to hurt the yin qi of the human body, resulting in stagnation of water and the formation of wilting.
Winter is the solar term of cold, and the accumulation of cold evil in the human body is often easy to damage the body's yang qi, resulting in stagnation of qi and blood, and blockage of meridians, resulting in paralysis.
In winter, it is affected by cold, and in winter, the yang qi is damaged, and the qi and blood are stagnant, forming a paralysis syndrome. The occurrence of paralysis syndrome is related to external cold and dampness, or internal injury, or long-term illness, or overwork, or poor diet. The pathogenesis of paralysis syndrome is mainly due to poor flow of qi and blood, blockage of meridians, and imbalance of viscera. The main purpose of paralysis is to remove cold and dampness, invigorate blood circulation, reconcile viscera, and restore the normal operation of qi and blood.
In winter, if you do not carry out effective conditioning in time, when the temperature rises in spring, temperature sickness may occur from time to time. Spring is the solar term of the wind, and the wind evil disease occurs rapidly, which is easy to invade the human body, causing the evil qi to stagnate and form a cave leak.
The occurrence of cavity is closely related to many factors such as external wind and heat, internal injury and diet, long-term unhealed disease, overwork, and improper diet. The pathogenesis of cave leakage is mainly due to the excessive yang qi and the depletion of fluid. **The key to the disease of cave leakage is to clear away heat and detoxify, nourish and nourish qi, moisturize and rejuvenate Jin, and reconcile yin and yang, so as to promote the normal production of jin fluid.
In winter, it is affected by cold, and in spring, it is invaded by wind evil, which causes the evil qi to linger and form the symptoms of cave discharge, which is the process of the occurrence of temperature disease. Warm disease is a combination of paralysis syndrome and cave discharge, which is a disease syndrome of mixed cold and heat, imbalance of yin and yang, and deficiency of qi and blood. The ** of warm disease is mainly treated by syndrome differentiation, according to the severity of the disease, the depth of evil qi, the rise and fall of yin and yang, and the deficiency and reality of qi and blood.
Many patients with fever have a history of cold injury in winter, and their conditions are consistent with the characteristics of paralysis syndrome and cavitation.
These patients, if they are paralyzed in time in winter or ventilated in spring, the occurrence of fever can be avoided.
In the case of warm disease, we cannot blindly clear heat and detoxify, but according to the changes in the condition, we must flexibly use cold medicine and warm tonic medicine to achieve the purpose of dispelling cold evil, restoring yang qi, harmonizing yin and yang, and balancing qi and blood.
This point of view of Ni Haixia has caused a lot of controversy in the Chinese medicine community, with some people agreeing with it, some opposing it, and some holding reservations. Those who agree believe that Ni Haixia's views are in line with the original purpose of the Neijing and are a great contribution to the study of warm diseases. Opponents believe that as for opponents, they will not judge today.