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Cancer is a collection of related diseases which affect the cell growth.

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Some of the cells of the body divide and spread into surrounded tissues.

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Cancer cells are less specialized than the other cells and they do not have many functions as the others.

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They are able to ignore signals that tell them to stop the division so the tumor grows.

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They are also able to invade the immune system which protects our body from infections.

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here you have the difference between a normal and infected cell cancer is produced by a proliferation

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of abnormal cells without control these these cells have the ability to invite and destroy

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tissues as a consequence of this excessive growth a tumor appears that can cause damage to both

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tissues nearby and distant this tumor's purpose is to destroy the organic tissues inside the human

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Some of the symptoms and signs of this disease are

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Breathlessness. It's usual to feel out of breath sometimes, but if it is very repetitive, could be cancer.

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Appetite loss, like for example if you have problems eating and you don't get enough nutrients.

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Weight loss without trying is common if you have cancer. It is often one of the first signs.

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Not all the reasons are available, but it is an estimate that approximately a half of the deaths by cancer may can be avoided at current healthy habits, no smoking, healthy diet, do exercise every day and use sun cream.

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There are five main categories of cancer. Carcinomas begins in the skin or tissues on the internal organ, mainly epithelial tissues like the one in the picture.

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Sarcomas develop in bones, muscles, fat or other connective tissues.

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Leukemia is a type of cancer which begins in the blood cells and affects the circulatory system.

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In the picture you have the difference between normal blood on the left and leukemia on the right.

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Lymphoma starts in the immune system which is a host defense system comprising many biological structures.

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Central nervous system cancer develops in the brain or in the spinal cord.

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What causes cancer?

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Ionizing radiations are radiations that affect our body due to random gas and ultraviolet radiation from the sun.

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Radiation therapy for one type of cancer can cause another type of cancer.

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There are other causes of cancer such as hormonal changes, viral and bacterial infections, genetic or inherited cancers.

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and human system dysfunction.

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Nowadays there are many treatments for the different types of cancer

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such as surgery, radiotherapy, chemotherapy and others

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but the best one is detecting the disease before it spreads through our body

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so it will be easier to eliminate.

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What does a cancer cell do?

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Which part of the body can be affected by leukemia, blood cells, epithelial tissue, or connective tissues?

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Which are the symptoms of cancer?