The cause of eczema is not clear, it may be related to genetic factors, environmental factors, mental factors, endocrine and metabolic changes, chronic infections and other foci. 1. Genetic factors: eczema has a certain genetic factor, if the parents suffer from eczema, the probability of their children suffering from eczema will also increase. 2. Environmental factors: Allergens, irritants and microorganisms in the environment may trigger or aggravate eczema, such as pollen and dust. 3. Mental factors: Negative mentality or mental factors may trigger or aggravate eczema, such as depression, mental tension, anxiety, etc. 4. Endocrine and metabolic changes: common ones include menstrual disorders, pregnancy and diabetes, etc., which may trigger itchy skin and eczema. 5. Chronic infectious lesions: eczema may be associated with chronic infectious lesions such as chronic cholecystitis, tonsillitis and ileal parasitosis. There are many causes of eczema, it is recommended that patients do a good job of prevention, if you suffer from eczema, you need to go to the hospital, with the doctor for standardized treatment.