Genuine mental illness is certainly no laughing matter, and millions of people all over the world suffer terribly with conditions like schizophrenia or severe depression. Everyone knows that acting a little crazy sometimes can be both fun and entertaining, but sometimes a person might act strangely due to a condition that is not a form of mental illness. Our bodies are complex systems that depend on a number of things being balanced in order to function normally. Sometimes it only takes a simple lack of a certain mineral or overproduction of a hormone to throw us off track and cause us to behave in very unusual ways.

1. Disease

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Several diseases and other serious medical conditions can cause a person to appear as if they are suffering from mental illness. They include, lupus, Parkinson’s Disease, stroke, brain tumor, low blood oxygen levels, epilepsy and liver disease.