There are two general causes of foaming at the mouth: organic poisoning and seizures. I. Organic poisoning refers to poisoning caused by ingesting food, drugs or chemicals. 1. Food poisoning is more common in life, the food consumed after bacteria, bacterial toxin contamination will lead to organic poisoning, common including staphylococcus and metaplasma bacteria. 2. Drug poisoning is more common in clinical and therapeutic process, such as digitalis overdose poisoning, aspirin poisoning, etc. 3. chemical poisoning, life familiar organophosphorus poisoning and paraquat poisoning belongs to this category. Second, epileptic seizures, leading to a variety of causes of seizures, including symptomatic, idiopathic, cryptogenic and other categories. 1. Symptomatic epilepsy refers to epileptic seizures caused by a variety of diseases, commonly seen in life, such as traumatic brain injury and brain tumors. 2. Idiopathic epilepsy, which refers to epilepsy with an unclear cause, mainly occurring at a specific age, and may be genetically related. 3. Cryptogenic epilepsy, refers to epilepsy in which specific symptoms occur before structural and functional abnormalities in the brain can be detected.