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/