"Schizo" means split, and "phrenia" in this case refers to the mind. Even though schizophrenia can be interpreted to mean "splitting of the mind," it does not refer to a split personality, as some media sources might portray. Rather, schizophrenia describes a scattered or fragmented pattern of thinking. Schizophrenia is actually a syndrome, meaning there are all sorts of symptoms that might be associated with it. Different patients might experience different symptoms, although the symptoms can be broadly categorized into three major areas: positive symptoms, negative symptoms, and cognitive symptoms. Most human symptoms from any illness are extreme versions of a normal physiological process. For example, everyone has a heartbeat, and tachycardia is a fast heartbeat. In the same way, everyone has a normal body temperature, but during a fever, that temperature is higher. In schizophrenia, patients have positive symptoms, which aren't positive in the sense that they're helpful, but positive in the sense that there's some new feature that doesn't have any normal or physiological counterpart. These are the psychotic symptoms, such as delusions, hallucinations, disorganized speech, and disorganized or catatonic behavior, none of which occur physiologically. Delusions are false beliefs that the person might feel very strongly about, so much so that they won't change their mind, even if you give them evidence against it. There are all sorts of different delusions, like for example, a delusion of control, where somebody thinks that some outside force or person or thing is controlling their actions. They could also be delusions of reference, where someone might think that insignificant remarks are directed at them, like a newscaster is speaking directly to them through the TV. Hallucinations are a second type of positive symptom, and can be any kind of sensation that's not actually there, including visual, but also including auditory sensations, like hearing voices or commands. A third type is disorganized speech, an example being something like a word salad, which seems like just a random jumbling of words or phrases, like "pencil, dog, hat, coffee, blue." Disorganized behavior, on the other hand, could be like if they exhibit some bizarre behavior that's out of context and doesn't seem to have much of a purpose, like for example wearing multiple layers of jackets on a hot summer day. Also sometimes their behavior is described as catatonic, which has to do with their movements, posture, and responsiveness, so like they might be super resistant to moving, or be in an unresponsive stupor. Negative symptoms are like when there's this reduction or removal of normal processes, this is like a decrease in emotions that they can express, or a loss in interest in things that they once found interesting. One type of negative symptom is called flat effect, where they don't respond with an emotion or reaction that would seem appropriate, like if they saw something very unexpected like a small monkey playing in their living room, they might simply sit and watch idly as if nothing was happening. Another type is alogia, or poverty of speech, which is a lack of content in their speech, so like if somebody asked them, "Do you have any children?" They might respond with, "Yes," instead of, "Yeah, one boy and two girls." A third type of negative symptom is avolition, which is this decrease in motivation to complete certain goals, so someone might stay home for long periods of time without trying to reach out to friends or find work. Cognitive symptoms are like not being able to remember things, learn new things, or understand others easily. These symptoms are more subtle though, and are more difficult to notice, and might only be detected if they have really specific tests performed, an example might be somebody not being able to keep track of several things at once, like a phone number and an address. People with schizophrenia seem to cycle through three phases, typically in order. During the prodromal phase, patients might become withdrawn and spend most of their time alone, and a lot of times this seems similar to other mental disorders like depression or anxiety disorders. During the active phase, patients experience more severe symptoms like delusions, hallucinations, disorganized speech, disorganized behavior, or catatonic behavior. Following an active phase, patients often enter into a residual phase, where they might exhibit cognitive symptoms like not being able to concentrate or becoming withdrawn again, as with the prodromal phase. For an official diagnosis of schizophrenia, patients need to be diagnosed with two of the following symptoms: delusions, hallucinations, disorganized speech, disorganized behavior, or catatonic behavior, or negative symptoms, and at least one of them has to be either delusions, hallucinations, or disorganized speech. So basically, they couldn't have just disorganized behavior and negative symptoms. Even though some patients have cognitive symptoms as well, they aren't specifically needed for a diagnosis. Also, for a diagnosis, signs of these disturbances must be ongoing for at least 6 months, meaning that they're likely in one phase or another for a period of 6 months, but there must be at least one month of active phase symptoms. And finally, those symptoms can't be attributable to another condition, like substance abuse. Now that we've diagnosed it, why does it even happen in the first place? What causes schizophrenia? Well, we don't really know, since it seems like the signs and symptoms of schizophrenia are pretty unique to humans, or at least they're hard to imagine or notice in animal models like mice or rats. One clue is that the majority of antipsychotic medication that improves schizophrenia symptoms block the dopamine receptor D2, which reduces dopamine levels in neurons. This suggests that maybe schizophrenia has something to do with increased levels of dopamine. These medications though are neither universally nor completely effective, and don't work for everyone with schizophrenia, which adds to the confusion and means there's probably more to it than just the D2 receptors. Interestingly, one of the most effective antipsychotic drugs, clozapine, is a weak D2 antagonist, suggesting that other neurotransmitter systems like norepinephrine, serotonin, and GABA are involved. Human studies have shown support for a genetic basis as well, even though there haven't been any specific genes conclusively linked to schizophrenia yet. Also, environmental factors like early or prenatal exposure to infection and certain autoimmune disorders like celiac disease have been linked with schizophrenia. Finally, another important set of clues involves the epidemiology. Schizophrenia seems to happen slightly more in men than in women, with onset in the mid-20s for men, but late 20s for women, and the clinical signs for schizophrenia are often less severe. Some studies suggest this difference might be due to estrogen regulation of dopamine systems. There doesn't, however, seem to be any difference among races. Now, treating schizophrenia can be really tricky, and antipsychotic medications are often used, but it's super important to combine the efforts of several clinicians and health professionals, including professionals in therapy or counseling, medicine, and psychopharmacology. Antipsychotics can be very effective at reducing symptoms, but they often come with a lot of additional considerations to keep in mind, like cost, and the potential for unwanted side effects like tolerance, dependence, and withdrawal. For more information, visit www.FEMA.gov.