Mental illness refers to a wide range of conditions that affect a person's mood, thinking, and behavior. These disorders can impact daily life, relationships, and overall well-being. Common types of mental illness include depression, anxiety disorders, and bipolar disorder. Symptoms can vary significantly, ranging from persistent sadness and worry to extreme mood swings. Mental illnesses are often caused by a combination of genetic, biological, environmental, and psychological factors. Treatment options may include therapy, medication, or a combination of both. Early intervention and support can lead to better outcomes, helping individuals manage their symptoms and improve their quality of life.