If you notice a change in personality, then, in principle, it is worth considering. You can try to go to a family psychologist so that it is not so striking. It is worth remembering that mental illness has a most likely period of onset (usually fail during maturation) and many other (non-mental) illnesses can alter mental state.
Well, first of all, forcing a person to go to a psychiatrist is not very normal. And to no avail. A person must go to a psychiatrist or psychologist himself, if he is capable and generally capable of making decisions. You can forcefully bring a person to a psychiatrist by the hand, but what's the point? It is not enough just to cite, you also need him to at least answer questions and have complaints himself.
Then, the category "going crazy" is very vague. For someone, "quitting his job and sitting on the Internet for days" is to go crazy. And for some, the natural paranoid delirium about the surveillance of the FSB and the agent-neighbor is just an outburst of imagination, sensitivity and forms of creativity.
The same depression is often perceived (by the patients themselves) as just lethargy, laziness and " you need to pull yourself together. "
So a lot depends on what is meant by" going crazy. "
About what noticeable anxiety markers can be identified.
1) Hallucinations. Hearing aids - too. 2) Lack of contact with reality. In fact, hallucinations are a special case. That is, a person cannot perceive something from the reality in which most people are. And vice versa, it can perceive some of its internal processes as real.
The border between internal and external is erased. The criticality of perception is lost. A person cannot distinguish between what is real and what is not. Often he cannot enter into full contact with another person, but is "in himself". Often there is incoherent speech, which is impossible to understand without a lot of thinking. And the person is not able to clarify the details.
Often a person cannot describe himself or other people. Cannot "tell about himself" or about someone close to him. Well, like, "It's just mom. She's good." that's all. No lengthy description.
More knee tests: understanding metaphors and proverbs. For example, "what does it mean: chickens are counted in autumn?"
Or drawing. For example, you might ask a person to draw an abstract but well-known concept. For example, love or friendship. If they paint banality, that's good. If they draw something swirling, abstract, incomprehensible - this can be a bell.
But in any case, you need to remember that a person must apply for psychiatric help himself. In addition, the diagnosis must be made by a doctor. Your suspicions are just your suspicions and you shouldn't hang labels on the basis of such cursory incompetent observations. Diagnostics is difficult and doctors do it.
In general, if there are suspicions, then there is nothing wrong with going to a psychiatrist "just in case". Now it is harmless, it is not included in any business. Treatment is voluntary and so on. That is, there is no need to wait for any hidden consequences.