How can I know if someone is mentally ill?

It's not quite easy to tell that a person is mentally ill like it is well someone is physically ill. Here are some tips to guide you
A Change in Personality. If you notice a change in character, someone acting like a different person, or not acting or feeling like themself. It can be a sign of mental illness.

If a person is also anxious, angry, or moody; all of these can be a red flag on a person's mental health.

Lack of self-care, if a person stops taking care of him or herself, it may be a sign of mental illness.

If a person shows signs of Hopelessness or look overwhelmed everytime, it's a sign of mental illness.

If a person that was out going sudden becomes social Withdrawn or isolated, is a warning sign of mental illness.

A person who just had a bad day is not suffering from mental illness, the person is just sad. There are some signs that you can look for to see if a person is suffering from mental illness such as the following: A change in character. This is not a mood change but a whole character change. The person seems to be a completely different person.

Another clue is the person is starting to contemplate suicide because the person’s depression is already too deep that the person does not see any future anymore. Another possible sign is a change in a person’s way of thinking. The person may barely get out of bed because the sadness that he is feeling.