The latest survey data show that more than 50% of people suffer from anorectal diseases, that is to say, every two people have one person with “exit problems”. Among them, anal fistula, is the high incidence of anorectal diseases in the fall and winter seasons every year. The predecessor of anal fistula is perianal abscess Anal fistula is not an acute attack of the disease, it has a chronic evolution process. Initially, you will find a hard lump at the anal opening, which you can feel with your hand. This hard lump gradually grows and forms an anal abscess, which is a bit painful. After the abscess breaks down, the pus inside flows out and suddenly it doesn’t hurt anymore. However, this does not mean the disease is cured. After that, pus will appear near the anus over and over again, and the cycle of swelling, breaking, and pus flow …… keeps on going. At this time, the anal fistula is formed by the anal abscess. If you just feel a lump at the anal opening, it could be a thrombosed external hemorrhoid, or it could be an anal fistula. This is the ordinary people themselves can not accurately determine. Therefore, once you feel something growing at the anus, it is recommended to go to the hospital as soon as possible for examination. Long-term pus may be low fistula If the location of the long anal fistula in the intestinal tract is relatively low, that is, relatively close to the anus, clinically known as “low anal fistula”. Once the low anal fistula ulcerated, the pus inside will be subject to gravity, out of the anus. Therefore, the discovery of pus in the anus, may be a fistula. So, what exactly does this pus look like? May be yellow, may be thin, close to transparent, and may be with pus and blood. Because once the external mouth of the anal fistula is broken, it will also bleed. Even the performance of individual patients: no pus, only bleeding. These are the external manifestations of low anal fistula. Inexplicably high fever may be high fistula If the location of the long anal fistula is relatively high in the intestine, it is not easy to ulcerate; with the prolongation of time, the disease continues to develop, the inflammation may not be downward, but upward, forming abscesses. In this case, the anal opening can not feel the hard bag at all, and there is no other external signs, resulting in a more hidden condition, but also more dangerous. If it goes undetected for a long time, sepsis, or even septicemia, can easily develop. When the pus produced by the inflammation develops into the rectum and the surrounding space, the space around the intestine will “swell”, and then cause fever and other systemic symptoms. This kind of pus and blood, if the formation of rectal fistula, recurring, will eventually cause rectal stenosis, make the condition more complex, more difficult to treat. This is not a common phenomenon, but it does exist, so please be vigilant. I once encountered such a case. The patient had a high fever for many days, up to more than 40 degrees, nuclear magnetic and other means of examination are used, is unable to find the cause of the disease. Finally found to be anal fistula. Because he grew the anal fistula location deeper, the deeper the location of the abscess, the more serious the fever, plus from the appearance of the changes can not be seen, it is difficult to judge. In fact, it is full of pus inside, and if you experience it carefully, you will have a strong sensation of falling. Once the abscess has progressed to the mucous membrane position, since the pain sensory nerves there are not very rich, it can only be felt as a falling sensation. And the more downward the location of the abscess, the more pain, and can feel the hard lump, easy to diagnose. Please what people are prone to suffer from anal fistula 1, foreigners more than Chinese data show that China’s population suffering from anal fistula accounted for 3-5% of the total population. And the international incidence rate reaches 8%. 2, northern people more than men In the clinical process for many years, we found that China’s Inner Mongolia, Northeast and other alpine zone living in the people, suffering from anal fistula in a large proportion; and the southern region of the case is less. This may be because, living in the alpine zone people, in order to protect the cold and prefer to drink, eat high-calorie food, coupled with high indoor temperatures in winter, there is a heater or even a fire kang and so on …… external hot and dry environment, and internal high-calorie food nutrition under the combined effect of the formation of. 3, young adults and men more from the anorectal patients can be seen, 20-40 years old young adults is the high incidence of anal fistula population. Among them, the incidence rate of men is much higher than that of women, and the ratio of men to women is about 5:1 or so.