What Is Cancer (Part III)

Other cancers have symptoms less physically obvious. Some brain tumors tend to present early symptoms of these diseases because they affect cognitive function important. Pancreatic cancer is usually too small to cause symptoms until they cause pain by pushing against nearby nerves or interfere with liver function to cause yellowing of the skin and eyes called jaundice. Symptoms can also be made as tumors grow and push against the organs and blood vessels. For example, colon cancer causes symptoms such as constipation, diarrhea, and changes in stool size. Bladder or prostate cancer causes changes in bladder function such as more frequent urination or rare. 

As cancer cells use the energy of the body and disrupt normal hormone function, are likely to present symptoms such as fever, fatigue, excessive sweating, anemia, and weight loss that can not be explained. However, these symptoms often occur in several other diseases as well. For example, cough and hoarseness may indicate lung or throat cancer and other conditions. 

When cancer spreads, or metastasizes, additional symptoms can present themselves in new areas affected. Swollen or enlarged lymph nodes are common and likely to be present earlier. If the cancer spreads to the brain, patients may experience vertigo, headaches, or seizures. Spread to the lungs can cause coughing and shortness of breath. In addition, the liver can become enlarged and cause jaundice and bone can be painful, brittle, and easily broken. Symptoms of metastasis ultimately depends on the location of the cancer has spread. 
How cancer classified? 

There are five major groups that are used to classify cancer. 

   1. Carcinoma is characterized by cells covering internal and external parts of the body such as lung, breast, and colon cancer. 
   2. Sarcoma is characterized by cells located in bone, cartilage, fat, connective tissue, muscle, and other supporting tissues. 
   3. Lymphoma is a cancer that starts in the lymph nodes and tissues of the body's immune system. 
   4. Leukemia is cancer that starts in the bone marrow and often accumulate in the bloodstream. 
   5. Adenoma is a cancer that arises in the thyroid, pituitary gland, adrenal gland, and other glandular tissue.

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