Understanding cancer disease: Causes and Symptoms


Cancer is defined as a disease in which there is an uncontrolled growth of abnormal cells in the body. There are many types of cancer. Usually, cancer disease is named after the organ or the cell where it starts. In some cases, from the original site, cancers can spread then move to other parts of the body.

How normal cell acts?

Cells are considered as the basic building blocks of the body. Our body is made up of trillions of living cells. Normal cells divide in order to make new cells to replace damaged or old cells. At the first years of a person’s life, normal cells divide faster to maintain his physical and mental growth. When a person grows into an adult, the division of cells is created to replace worn-out or dying cells or to repair injuries.

How cancer develops?

lung cancer cell

Cancer disease starts when some cells in the body don’t follow an orderly path of growth, division, and death. Instead, they uncontrollably grow and do not die. Unlike normal cells, cancer cells are also able to grow into other tissues.

Normal cells develop into cancer cells due to the breakdown of the controls that regulate cells. These controls are originated from the genetic plans in a cell’s DNA (deoxyribonucleic acid). A change in structure of a genetic material called a mutation, which may affect the cell’s control system.  Sometimes, a mutation is caused by outside factors such as carcinogens which can be found in tobacco, alcohol, dietary fat, sun exposure, radiation exposure, coal, and more, in other cases, it can be related to some certain types of viruses, bacteria, and parasites. In addition, some people are born with a mutated gene.

Mostly, the cancel cells form a tumor. At the beginning, tumor just only puts pressure on nearby tissues, however, some malignant tumors can invade the surrounding body tissues or more seriously spread within the body through bloodstream.

What are general signs and symptoms of cancer disease?

There are several types of cancer and each has different signs and symptoms. But there are also general symptoms can be detected before cancer become more severe:

Chronic pain

A long lasting and unexplained pain which you find it difficult to get rid of in a specific area of your body may be a symptom of early cancer. You can identify where the cancer is from by the type of pain and the place you are experiencing hurt in your body. For example, a chronic headache can be caused by a brain tumor, a back pain can be the sign of an early colon cancer disease.

Unexplained weight loss

When you lose weight without being aware of the reason, it’s called unexplained weight loss. If you suddenly lose more than 10 pounds without any reason, it may be the first sign of cancer which can usually be pancreatic, stomach and lung cancer.


Fever is one of the most common symptom of cancer which often occur after cancer has started to spread to other parts of the body or is in the bloodstream like leukemia or lymphoma. Almost cancer patients have to suffer from fever at some specific time.


cancer symtoms

If you are frequently having a feeling of being extremely tired and don’t want to do anything but rest can’t help, it may probably be a symptom of cancer like leukemia. Some colon or stomach cancers can cause blood loss which makes the patients tired always.

Skin changes

Be careful with changes in the size, shape or color of a mole, wart or mouth sore. A part from skin cancer, other types of cancer can also be detected by skin changes, including:

– Darker looking skin (hyperpigmentation)

– Yellowish skin and eyes (jaundice)

– Reddened skin (erythema)

– Itching (pruritis)

– Excessive hair growth



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