▲Autoimmune diseases attack different parts of the body and decrease its ability to fight invaders, causing vulnerability to infections. There are more than 30 different illnesses caused by autoimmune diseases, which currently affect around 5% of the world's population. There is still much to learn about the causes of immune-system disorders, but here's what we do know.

▲An autoimmune disease is a condition arising from an abnormal immune response to a normal body part in which the body attacks and damages its own tissues.

▲In normal cases, when an intruder invades our body the immune system protects us by identifying and eliminating the attacker. However, if the immune system is deficient it can actually end up attacking healthy cells, thus decreasing the body's ability to fight infection.

▲According to latest statistics, autoimmune diseases affect approximately 3 to 5% of the world's population.

▲Many theories exist as to why autoimmune diseases occur. The basic notion is that autoimmune diseases are thought to arise from an overactive immune response of the body against substances and tissues normally present in the body. External environmental factors may trigger a genetic predisposition to disease, cause changes to hormone levels, or compound low immunoregulatory control.

▲Recorded incidences of autoimmune diseases have increased over the last 40 years. Future predictions indicate that these diseases will affect between 15 and 20% of the world's population.

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There are more than 30 illnesses caused by autoimmunity, each of which is identified by different symptoms and attacks specific areas of the body.

▲Autoimmune diseases can affect nearly every part of the body including heart, brain, blood vessels, the nervous and digestive systems, muscle and skin tissue, eyes, joints, lungs, kidneys, and various glands.

▲Depending on the condition, classic symptoms of an autoimmune disease include inflammation, painful rashes, and swelling.

▲Rheumatoid arthritis or psoriatic arthritis are common examples of autoimmune disease. Sufferers complain of stiff, painful joints and restricted function.

▲If it affects the thyroid gland, as in Graves' disease or thyroiditis, the condition can cause fatigue, weight gain and muscle pain.

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If the attacks affect the skin, as in systemic sclerosis, vitiligo, and systemic lupus erythematosus, the disease can cause wounds, blisters, and color changes to the epidermis.

▲There are many examples of autoimmune diseases, which can attack various regions of the body as well as specific glands and organs.

▲Many hypotheses exist as to why autoimmune diseases appear and how they may be treated. Several are controversial, including the suggestion that just practicing better hygiene habits can reduce instances of immune system disorders.

▲Another controversial opinion is that it's the infection itself that causes an autoimmune disease and not the other way round.

▲While it's not known exactly what triggers the onset of autoimmune disease, there are three basic components that kick-start a disorder:

▲The genetic predisposition of the individual can determine how the disease will manifest itself.

▲Environmental factors also play an important part in the development of the disease.

▲And it is also important to remember that an imbalance of cells within the immune system can trigger an autoimmune disease.

▲Diagnosis of autoimmune diseases is made with blood tests that identify autoantibodies.

▲Treatment of these diseases is based on reducing immune system activity through the administration of immunosuppressive drugs (for example, corticosteroids).

▲However, it is not possible to carry out immunosuppression of undesirable antibodies alone. The patient therefore has to undergo general immunosuppression, leaving them more exposed to infection by other elements of the disease.

▲Allergies are not autoimmune disorders and it's important not to confuse the symptoms of an allergy with those of an autoimmune disease.

▲While studies have identified a link between allergies and the development of an autoimmune disease, the two disorders are completely different.

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There is some similarity in treatments for allergies and autoimmune diseases, but the effectiveness of drugs varies. Further, allergies do not attack the body's own tissues.

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LIFESTYLE Health

Autoimmune diseases attack different parts of the body and decrease its ability to fight invaders, causing vulnerability to infections. There are more than 30 different illnesses caused by autoimmune diseases, which currently affect around 5% of the world's population. There is still much to learn about the causes of immune-system disorders, but here's what we do know.