Addiction medicine deals with patients suffering from a wide variety of addiction problems. It aims to free people from their addictions while providing support, counseling, and mental health services. Medical professionals who work in addiction medicine can help patients work through the detoxification process as well as provide harm reduction tactics and rehabilitation services. They may also treat conditions like hepatitis and HIV, which are related to addiction issues. This type of medicine is often associated with public health.

Geriatric psychiatry is a subfield of psychiatry that focuses on the mental health needs of elderly patients. As people age, they face a variety of newfound problems, and this often takes a toll on their mental health. In addition, chronic illnesses can have a negative effect on mental processes and emotional processing. With the help of a geriatric psychiatrist, older people can live longer, healthier, and more fulfilling lives as they go through the aging process.