Into the problem, the common cause of influenza is viral flu and bacterial flu. In any case, it is because foreign microorganisms invade the respiratory tract that cause local or systemic multiple local inflammatory reactions (if not controlled in time, the microbial blood is spread all over the body, this is almost inevitable, the number of priorities is different).
Since it is spread all over the body, one or more local inflammatory reactions are unavoidable, and these parts cannot escape the symptomatic range of redness and heat pain. (Acute inflammatory reactions usually have red, swollen, heat, pain, functional hiding and other changes, with always accompanied by fever, leukocytosis and other systemic reactions at any time. Changes in this area is essentially a reflection of the body’s fight against inflammatory factors. This kind of disagreement struggles through the inflammatory process. After the inflammatory factors act on the body, on the one hand, it causes the destruction of the tissue cells, which causes the cells of the local tissues to show degeneration and necrosis; on the other hand, it induces an increase in the resistance of the body to facilitate the elimination of the disease. Inflammation factors allow the damaged tissue to be repaired so that the body’s internal environment and the internal and external environment reach a new equilibrium.)
Inflammation causes local edema because exogenous microbial infections increase the permeability of the local capillary walls and cause plasma proteins to enter the tissue fluid, causing local osmotic pressure to rise and absorb water. The result is tissue edema.
It is followed by pain. After tissue damage (microbial invasion, autologous cell damage caused by inflammatory factors), local tissue responds to normal, harmless stimuli (tact induced pain), not only for mechanical and thermal damage from the damaged area. Stimulation, stress stimuli are too reactive (primary hyperalgesia), and strong responses to mechanical stimuli from undamaged areas surrounding the injury zone (secondary hyperalgesia, these changes are spinal dorsal horn neurons after injury Increased excitability, that is, central sensitization pain. (The specific is too large, can not be flattened, specifically we can refer to the pain mechanism. In short, the pain is followed.)
It is particularly pointed out that the source of infection that causes eye pain is the adenovirus in the virus, which can clearly infect the respiratory tract, gastrointestinal tract, urinary tract and bladder, eyes, liver, etc., especially the eye, its specific invasion. conjunctiva.
In popular science, eye infection with adenovirus can cause mild eye infections (this is the common cold discomfort everyone feels), and follicular conjunctivitis can be caused by many other types of adenovirus, similar to chlamydial conjunctivitis (chlamydia Mycoplasma can clearly invade the conjunctiva) and is self-limited (self-restriction is self-recovery). The keratoconjunctivitis caused by adenovirus types 8, 9 and 37 is a severe infection, highly contagious, starting with acute conjunctivitis, spreading to the lymph nodes in the ear, followed by keratitis (this is more serious, once it appears, need to pay attention) .
In general, if the adenovirus invades the eye, the local inflammatory reaction is concentrated, so local edema, fever, pain and other discomforts are also concentrated. In addition, the use of the eye is necessary, which also makes the eye more sensitive and aggravates the paresthesia.
When the cold disappears, the root cause of eye pain and swelling disappears, so the eyes will not hurt. Therefore, to solve the cold-induced eye pain, the most important thing to do is to solve the cold.