Cancer happens for mutation in genes causing - the rapid growth of cells, failure to stop uncontrollable growth and making mistakes while repairing the DNA errors. A gene mutation can occur in several instances. Like, one can be born with a gene mutation or one can develop a gene mutation after birth.

For the first scenario, most of the time gene mutation is inherited from parents or any close relatives. Although, a percentage of cancers is counted in this category. But in the case of developing gene mutation after birth accounts for the majority of the cancers. One can develop a gene mutation through various kinds of things. Such as - smoking, radiation, viruses, cancer-causing chemicals (carcinogens), obesity, hormones, chronic inflammation and a lack of exercise.

Depending on the area of the body where cancer is developed, the symptoms vary from one to another. Following are the types of cancer and their symptoms as below:

• Severe pain in specific body parts. 

• Fatigue 

• Lump or area of thickening that can be felt under the skin.

• Sudden unintended weight changes - including gain or loss.

• Unexplained bleeding and bruising

• Persistent cough and troubled breathing

• Sudden changes in bowel and bladder habits

Most prevalent Cancers

American Cancer Society - https://www.cancer.org/

Mayo Clinic - Cancer Data