Some common symptoms of mental illness include:
1. Changes in mood: This could manifest as feelings of sadness, hopelessness, irritability, or anger.
2. Changes in behavior: This could include becoming withdrawn, isolating oneself from others, changes in sleep patterns, or changes in appetite.
3. Difficulty thinking or concentrating: This could manifest as trouble with decision-making, difficulty concentrating, or a decreased ability to remember things.
4. Unusual perceptions or beliefs: This could include delusions or hallucinations.
5. Unexplained physical problems: These could include headaches, stomachaches, or other physical symptoms that have no clear medical cause.
The type and severity of symptoms can vary greatly depending on the individual and the specific mental health condition they are experiencing. Some common mental health conditions that may present with these symptoms include depression, anxiety disorders, bipolar disorder, schizophrenia, and personality disorders. It's important to note that mental illness is complex and can be difficult to diagnose accurately, so it's essential to seek professional help from a mental health provider.