There is no mental illness that is more dangerous than others. This is because they are all dangerous in their own right. Mental illness is one of the biggest health problems that people are facing today. People have dealt with it for years, but today, more awareness is being bought to the conditions.
They are all dangerous because they can impact a person's health. For example, conditions like anorexia can lead to issues with the heart and high blood pressure. Conditions like anxiety can lead to panic attacks, which results in loss of breath and chest pains. All mental illnesses can be dangerous in their own right.
I don't want to believe that a particular mental illness is the most dangerous. Mental illness of whatever kind is one of the most dangerous health problems that a lot of people are facing today. As much as there are some mental illnesses that sound too dangerous, the severity of all kinds of mental illnesses should be the point here. A lot of people still think that anxiety disorder, being one of the most popular types of mental illness, is the most dangerous.
As much as anxiety disorders can lead to terrible diseases, eating disorders is also as dangerous as anxiety disorders. I've read about how a lot of people took their lives just because they couldn't manage and cope with their condition. A very less popular type of mental illness could be very dangerous if it was allowed to aggravate into something that can't be controlled. At times, what makes something look dangerous largely depends on our attitudes to correct and prevent such from happening.