list of mental diseases
Signs and symptoms of mental illness can vary, depending on the disorder, circumstances and other factors. Mental illness symptoms can affect emotions, thoughts and behaviors. Examples of signs and symptoms include: 1  Feeling sad or down. 2  Confused thinking or reduced ability to concentrate. 3  Excessive fears or worries, or extreme feelings of guilt. 4  Extreme mood changes of highs and lows. 5  Withdrawal from friends and activities.