Causes of Cancer

Imagine you get a call from your doctor telling you that you have a cancer. What is your reaction? Most people are scared of cancer. Cancer is one of the major causes of illness and death every year in the world. If anyone gets cancer, he/she will fight against it for the rest of his/her life. It will be a big challenge to patient and his/her family. The causes of cancer are plenty, but most common and important factors are the following.

First, genetics is an important factor to cause cancer. Some cancer factors can transfer to the next generation from genes. That’s why some people get cancer easier if their family was a disposition towards cancer. Usually, the offspring of high blood pressure families get hypertension; the offspring of high blood cholesterol families get coronary heart disease; the offspring of fat or overweight families get obesity. Cancer follows this way, too.

Second, the environment is another important factor to cause cancer. Environment deterioration is more and more severe because of the rapid development of technology and industry in the past years. Studies show that lung cancer which is the second highest rate cancer in U.S. is highly related to air pollution. Many companies and business pursues money but neglect their health. Tobacco or cigarettes is another critical factor of lung cancer. In modern life, many people smoke a lot to reduce stress. There are many harmful ingredients like nicotine in cigarettes which destroy pulmonary alveoli. Even people who don’t smoke can inhale second hand smoke every day. If a person inhale or is inhaled smoke for a long time, he/she probably get emphysema, COPD even lung cancer. The ultraviolet radiation from the sun especially in the summer can cause skin cancer. In U.S. some people like sunbathing under the hot sun just for fun.

Third, diet and activity are also causes of the cancer. In modern life, many people eat fast food frequently because they are fast and cheap. But fast food