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Am I Going Through a Nervous Breakdown?

Beautiful Voyager

Etiology may include mental health disorders such as anxiety disorder, depression, or schizophrenia. Psychosis, e.g., paranoia, hallucinations, or delusions. Your symptoms may be mild to severe and differ from someone else's depending on the underlying cause of the breakdown. Frequent thoughts of self-harm or suicide.

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10 Ways Substance Addiction Can Change Your Personality

Gateway Foundation

Other substances like methamphetamine or cocaine can lead to reckless behavior due to paranoia or overconfidence. Paranoia Paranoia is another common symptom of substance use. Addiction can also worsen symptoms of severe mental illnesses like schizophrenia or bipolar disorder, leading to paranoid feelings or behavior.