Schizophrenia

There is currently no concrete answer to that question. Scientists have multiple theories on what could cause Schizophrenia but no one has any definite proof. Schizophrenia causes have been narrowed down to these 3 theories:
-The first theory is that Schizophrenia is carried forward by genes. There is definitely a correlation between family history of Schizophrenia and the descendants having the illness but Schizophrenia can also trigger in people that have no family history of the illness. It is usually triggered when a person goes through hormonal changes such as puberty or when they have to deal with a particularly stressful experience such as the death of a loved one.
-The second theory implies that people with Schizophrenia have a different brain structure all together. Their brains might have formed differently when they were still in the womb. There is also evidence to suggest that people with schizophrenia have a different balance of the big three chemicals that maintain your mood; namely Dopamine, Serotonin and Glutamate. The imbalance of these chemicals can happen for a number of reasons including birth complications.
-The risk of schizophrenia can also be increased through viruses and bacteria. There is proof that says that babies whose mothers have the flu before birth have a higher chance to develop schizophrenia. It can also develop in people who are hospitalized because of serious infections.