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As of 2014, the underlying causes of schizophrenia are not known with any certainty, according to Mayo Clinic. The disorder tends to run in families, though some cases occur without a family history of the condition, lea... More »

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Paranoid schizophrenia is a form of schizophrenia that causes individuals to experience delusions that other people are conspiring against them or persecuting them, explains PsychCentral. Paranoid schizophrenia patients ... More »

www.reference.com Health Conditions & Diseases Mental Health

The symptoms of schizophrenia vary from person to person and in the same person over time, and they do not always include visual hallucinations, Mental Health America says. The most common type of hallucination in schizo... More »

www.reference.com Health Conditions & Diseases Mental Health
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Symptoms of a schizophrenia may vary but typically include delusions, hallucinations, disorganized thinking or speaking, abnormal motor behavior or other negative cognitive behaviors, according to the Mayo Clinic. Having... More »

www.reference.com Health Conditions & Diseases Mental Health

Certain experiences, medical conditions or medications may cause anxiety, the symptoms of which include feeling nervous or powerless, an increased heart rate, rapid breathing and sweating, states Mayo Clinic. Anxiety oft... More »

www.reference.com Health Conditions & Diseases Mental Health

The exact cause of Alzheimer's, which is the death of brain cells, is not known, but it is believed to be caused by a combination of genetics, lifestyle and environment, according to the Mayo Clinic. Family history can p... More »

www.reference.com Health Conditions & Diseases Mental Health

As of 2015, the cause of oppositional defiant disorder is unknown, but inherited and environmental factors are contributing causes, notes Mayo Clinic. They include the temperament of the child and problems with parenting... More »

www.reference.com Health Conditions & Diseases Mental Health