Each mental illness has its own characteristic symptoms. However, there are some general warning signs that might alert you that someone needs professional help. Some of these signs include;
- marked personality change,
- inability to cope with problems and daily activities,
- strange or grandiose ideas,
- excessive anxieties,
- prolonged depression and apathy,
- marked changes in eating or sleeping patterns,
- thinking or talking about suicide or harming oneself,
- extreme mood swings—high or low,
- abuse of alcohol or drugs, and
- excessive anger, hostility, or violent behavior.
A person who shows any of these signs should seek help from a qualified health professional. You can read more about the warning signs of mental illness at https://www.ncbi.nlm.nih.gov/books/NBK20369/