Although the immune system usually prevents disease, sometimes it can cause it.
There are several diseases caused by an overactive immune system such as Allergies, asthma or hay fever. There are also diseases that affect the Autoimmune system, where the body fights against its own cells (EG: multiple sclerosis (where the body fights against myelin sheath) and juvenile onset Diabetes (Type 1) (where the immune system fights against B cells (islets of langerhan) in the pancreas)). Parts of the immune system may also become diseased. Failure of the entire immune system is immune deficiency such as in AIDS or HIV. This occurs when the immune system fails to produce antibodies.
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If one or more system fails to function the other system starts to compensate by working harder. So it is important to be checked and evaluated by your medical professional, so that proper treatment and care can be provided. Our body is very complex and wise in recognizing if there is something wrong, but sometimes we tend to ignore it.
If one body system stops working the whole body will be affected. For example, if the circulatory system stops working the respiratory system will fail because it depends on the circulatory system.
you die or you get put under a machine until they find an organ to replace it with or els!!
Sorry to say, but you would die. Because, your body wouldn't be able to grow, regulate blood pressure, regulate water balance, or activate other glands. Just saying... Have a good day!