Mental illnesses are diseases or conditions that affect how you think, feel, act, or relate to other people or to your surroundings. They are very common. Many people have had one or know someone who has.

Symptoms can range from mild to severe. They can also vary from person to person. In many cases, it makes daily life hard to handle. But when an expert diagnoses you and helps you get treatment, you can often get your life back on track.