There are various causes of irritability, the most common being mainly due to anxiety symptoms. Patients tend to have uncertainty, anxiety, nervousness, and fear, leading to irritability and restlessness. It may also be caused by psychotic symptoms, such as hallucinations, where patients feel very nervous when they hear a type of sound and become irritable, or obsessive-compulsive disorder when they do or think about something repeatedly, and patients also feel irritable. When there is a sleep disorder, many patients will toss and turn, and they will also become irritable at this time. All in all, there are various causes of irritability, and they need to be identified according to different situations. Of course, normal people can also be irritable, such as when they fail an exam, immediately enter the examination room, or immediately need to defend themselves, etc. They may also have anxiety and irritability in the early stage.