Many people are concerned about the side effects of radiation therapy, for example, will it cause other conditions such as dementia or brain tissue damage after being irradiated? From a dialectical point of view, there are two sides to everything. The doctor’s responsibility is to take advantage of the advantages and minimize the disadvantages of the treatment as much as possible, so as to avoid the shortcomings and achieve the best results and cause the least damage. There are three types of radiotherapy techniques: general radiotherapy, precision radiotherapy and gamma knife, each of which has its own advantages and disadvantages. Gamma Knife technology avoids damage by focusing, and has relatively few complications, but improper use can also bring undue damage to patients. At present, these three radiotherapy techniques, or gamma knife radiotherapy has the least side effects? Because of the long duration of general radiotherapy, the dose is gradually superimposed, and after irradiation, normal tissues are repaired, while tumor tissues have low tolerance and cell necrosis and extinction occur. In addition, ordinary radiotherapy affects a wide range of normal tissue interference, and therefore more side effects. Gamma knife is the shortest treatment time among these technologies because the principle is different. Of course, gamma knife also has side effects, such as common nausea, vomiting, fatigue, etc.. In terms of comparison of these treatment modalities, Gamma Knife side effects are slightly less, the incidence is lower, and most patients can tolerate. The net friend is more concerned about the side effects of irradiation, he is concerned about the radiation pneumonia caused by previous radiation therapy, gamma knife has this risk? The advantages of the gamma knife is still reflected in the treatment of head disease, including equipment is also the head gamma knife has advantages, recognized by the neurosurgery. The side effects you say refers to the so-called whole body gamma knife, is borrowed from the name of the head gamma knife, in fact, is not the same equipment. Because it is also a radiotherapy technique, there is also a risk of radiation pneumonia. Although the tissue damage is indeed reduced by the aggregation method, the radiation range becomes wider in the face of larger lesions, and after gamma knife treatment, the whole tumor shrinks and the tissue on the lung is disturbed, and there may be side effects. To minimize the side effects of radiotherapy from the medical point of view of beneficial treatment, the first to grasp the size, strict control of the indications, the second control of dose, the doctor can know through the planning of the treatment dose is how big, what is the scope of the ripple, then as a doctor, must accurately calculate the dose, in terms of the scope, to be as small as possible, if all the scope of treatment, perhaps the potential tumor are killed, the lung is also The lung function is affected. It is important to master a reasonable range. Finally, I would like to remind you that if you do head diseases common trigeminal neuralgia, brain metastases, pituitary tumors, meningiomas, cavernous hemangiomas, arteriovenous malformations, etc., must choose the head gamma knife, do not use any whole body gamma knife, after all, the treatment of a large range, radiation penumbra must be large, the dose distribution is not good, but also, the precision of treatment is reduced, the side effects are large.