What is the danger of spider bite mainly depends on the toxicity of the spider, if the spider is not poisonous, it is usually not serious, if the spider is poisonous then it may cause toxic reaction, and immediate medical attention should be sought. 1. Non-poisonous spiders: if patients are bitten by non-poisonous spiders, most of them will not have obvious discomfort, and some of them may have localized redness, pain and swelling. Usually no special treatment is needed, only simple cleaning and disinfection of the bitten area is enough. 2. Poisonous spiders: If bitten by poisonous spiders, patients may have toxic reactions, such as headache, dizziness, nausea, vomiting, etc., and in serious cases, it may also cause laryngeal edema and difficulty in breathing, etc. It is recommended that patients go to the hospital in time for examination, and according to the different reactions of intoxication, different targeting methods of treatment will be adopted. If you are bitten by a spider but are not sure if it is poisonous, or if you have symptoms of physical discomfort, you should seek medical examination and treatment immediately to avoid delaying your condition.