I can provide the following general information. Please note that practices and regulations can vary by region, so it's essential to consult local laws and guidelines for the most current and accurate information.
In many countries, therapists, including psychologists, psychiatrists, and licensed mental health professionals, are qualified to diagnose mental illnesses. Their training and expertise enable them to assess and diagnose various mental health conditions based on recognized diagnostic criteria, such as those outlined in the Diagnostic and Statistical Manual of Mental Disorders (DSM) or the International Classification of Diseases (ICD).
However, the specific rules and regulations around diagnosis may differ depending on the country and the professional's credentials. For example, psychologists and psychiatrists generally have the authority to diagnose mental illnesses, while some other types of therapists may not be allowed to make formal diagnoses.
If you believe you might be experiencing symptoms of a mental illness or need a diagnosis, it's essential to seek help from a qualified mental health professional, such as a licensed psychologist or psychiatrist. They can provide a comprehensive evaluation, diagnosis, and appropriate treatment if necessary. Always ensure you are consulting with someone who is licensed and authorized to diagnose and treat mental health conditions in your specific location.