There are more reasons that cause the memory to get worse after 20 years old. The first thing to consider is irregular life, incorrect lifestyle, staying up all day, and drinking excessive alcohol, smoking, and drinking coffee and strong tea at the same time, causing a decrease in work efficiency on the 2nd day and gradual memory loss due to lack of sleep and causing problems with brain function. Secondly, we should consider some diseases, such as demyelinating diseases and multiple sclerosis, which are mostly seen in young people, especially young women. When memory problems occur, accompanied by recurrent dizziness and headaches, you should still consult a neurologist for relevant examinations in a timely manner. Of course, patients themselves should not be nervous, to maintain optimism, to ensure sleep, regular life, while developing good sleep hygiene habits, their own have to reduce the pressure, if there are underlying diseases, such as hypertension, diabetes and other family history, or should be corrected and treated in a timely manner