Immunological diseases are caused by defects in immune system. The immune system may be hyperactivated to release antibodies and other chemicals. This results in allergy and anaphylaxis. Sometimes the immune system fails to differentiate self cells from no-self cells, resulting in autoimmune diseases. In this situation, the immune system is challenged and evoke responses that damage cells and tissues rather than protecting. All the immunodeficiency diseases increase the risk of tumours and infections and are caused by malnutrition, immune suppresents, gene mutations, and viruses such as HIV.
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