David rosenhan and colleagues conducted a study examining the biasing power of diagnostic labels. they went to hospital admissions offices and complained of "hearing voices," saying empty, hollow, and thud. this was the only complaint they reported, and they displayed no other symptoms. they were all:

This particular experiment is called the Rosenhan Experiment, and during this experiment, while conducting their complaints and explaining their symptoms, all were diagnosed mentally ill,  treated and admitted accordingly. After admission, the patients stated they feel fine already but they were forced to admit a mental illness and to be treated with antipsychotic drugs as condition for their release.