Febrile convulsions are quite common for pediatric patients. As a pediatrician, everyone has dealt with ‘febrile convulsions’, and in one day we had 5 children with febrile convulsions in our clinic. Who doesn’t know about febrile convulsions? But is this seemingly simple condition really understandable to you? Today we will present a case. The child was a 2-year-old boy who had his first convulsive episode with high fever from 5 months after birth and was diagnosed with febrile convulsions at that time. It later occurred 4 times within 1 week of age, each time with fever. The child was treated for febrile convulsions at several hospitals, but the child never improved. After the first year of life, convulsive episodes occurred with low fever, sometimes even with a hot bath, and the parents were afraid to bathe the child and vaccinate him. MRI of the skull and brain did not show any abnormality. Two general EEGs were done and no abnormal discharges were found. The parents were very distressed, what is going on? This case is an epileptic syndrome, which we call Dravet syndrome. It is the most severe form of febrile convulsions and used to be called infantile severe myoclonic epilepsy, which differs from ordinary febrile convulsions in that Dravet syndrome has an early onset, with fever accompanied by convulsions generally appearing 3-8 months after birth, with a variety of seizure forms, a long convulsion time, mostly more than 5 minutes, and one side of the limb convulsions for The diagnosis is meaningful, heat sensitivity is the main feature, fever must twitch, low fever is twitch, later is no fever also twitch. Developmental regression. Although it is an epileptic syndrome, there are few discharges in the EEG, which are not easy to catch, and the EEG is normal in the early stage. Severe clinical symptoms but mild EEG is also a feature of Dravet syndrome. Dravet syndrome is now found to be associated with sodium channels in the body, and the diagnosis can be determined genetically. Once Dravet syndrome is suspected, the genes can be checked for clarity. Although it is an epilepsy syndrome, Dravet syndrome is not uncommon in clinical practice and is just sometimes overlooked without recognition. In addition to Dravet syndrome, there is another epilepsy syndrome that starts with febrile convulsions that needs attention, called Doose syndrome, which also has the name myoclonic-atonic epilepsy, and some people refer to it as myoclonic standing inability. Nearly three-quarters of patients with Doose syndrome are boys. Nearly one-quarter of Doose syndrome is associated with febrile convulsions, having had febrile convulsions within 1 year of age, whereas Dravet syndrome almost always has a history of febrile convulsions. seizures in Doose syndrome are characterized by the presence of drop seizures and the absence of partial seizures. The EEG shows extensive spike and slow wave activity but no constant focal discharges. Doose syndrome is also clinically and EEG heavy compared to Dravet syndrome. Cognitive impairment is less severe than in Dravet’s syndrome. The prognosis of Doose syndrome is better than that of Dravet syndrome, and most of them can be controlled. Doose syndrome can also be treated with lamotrigine, while Dravet syndrome cannot be treated with lamotrigine, otherwise it will be more severe. Back to febrile convulsions. It is written in textbooks that febrile convulsion (FC) is the most common convulsive disorder in infants and children. It is defined as a convulsive episode with fever that occurs in infancy and childhood and excludes central nervous system infection and a history of febrile convulsions. The prognosis for common febrile convulsions is good. However, when diagnosing febrile convulsions it is important to think more about the possibility of an epileptic syndrome or whether there is a tendency for it. For either Dravet syndrome or Doose syndrome, early detection, rational use of antiepileptic drugs and early seizure control can reduce cognitive impairment in children.