I need to know a term that refers to a person who is mentally non-disabled but has a kind of mental issue because of which sometimes acts weird; such as, starts laughing suddenly or crying or using abusive language, then they come back to the normal state and act normal.
I found one but I'm not sure if it is right.
Disruptive mental health
Saying someone "acts weird" sounds like a personal opinion. If you mean they act unconventionally or disparate from social norms, that doesn't mean anything is wrong with them at all. Their differences to you could just be cultural. But, if you mean their behaviour is socially unacceptable then you may be speaking about emotional, behavioural, interpersonal or personality issues.
While it is true that some mental health disorders affect the above, to be defined as a mental health disorder the issue must include clinically significant disturbances in cognition, emotion regulation, behaviour etc, cause distress or impaired functioning, and be rooted in biological, psychological, or developmental processes.
To be clear, this is not a diagnosis of any individual. Only a medical professional can say if an individual has a mental health disorder or not; likewise, emotional, behavioural, interpersonal or personality issues would be identified by a professional in psychology or similar specialty.
Edit
We could say generally this person is struggling with their mental health and has wild mood swings. It's not appropriate for non-medical professionals to use psychiatric terms on a person.
(Described in the links below are some psychiatric terms used in my original answer. They are for the medical specialists and are for our information only.)
The term "disruptive mental health" is not a specific diagnosis or condition.
If I understood correctly, you are asking:
"What term describes someone without a diagnosed mental disorder but who occasionally experiences sudden emotional or behavioral changes?"
The symptoms which OP mentioned is called Pathological laughter and crying Also called: PBA, pseudobulbar affect. Inappropriate involuntary, sudden laughing and crying due to a nervous system disorder. This behavior may have various causes,
1. Pseudobulbar Affect (PBA):.
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A condition characterized by sudden, uncontrollable, and inappropriate episodes of laughing or crying.
2. Pathological laughter and crying:.
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A form of affect lability involving frequent, involuntary emotional outbursts. It is often associated with neurological conditions such as Alzheimer's disease, ALS, MS, Parkinson's disease, stroke, and traumatic brain injury.
It's essential to note that only a qualified mental health professional can provide an accurate diagnosis and guidance. If someone you know is experiencing these symptoms, consulting a mental health expert for proper evaluation and support is crucial.
In US slang, the word 'spaz' can describe a person like that. The meaning has changed over time and it does not mean the same thing from person to person. It is sometimes used to describe someone who is either excessively energetic, or easily startled into having a physical response, or spontaneously starts to move their body for no reason, though it could also mean a very clumsy person, or even someone who is nerdy or uncool. It is not typically a way to indicate that someone has an actual psychological or physical disorder. It is sometimes a pejorative term but can also be used in a teasing or endearing way. The word may be falling into disuse because of its origins as a derogatory term for physical disability.
However, in British English and possibly other regions outside of the US, "spaz"—along with "spastic", which it is an abbreviation of—is an extremely offensive slur. You should be very careful not to use it if you are unsure whether it is a slur in the region where you are saying it.
