Cancer is a dreadful disease and is become so common that out of 5 people 1 has it. I think its way of God showing his presence. A person who drinks, smokes and eats junk food do not get cancer all his life but other person who do not have all such habits and living healthy life gets cancer. The reason to it is unknown. Whatever we do we cant stop it. Even a great sportsman like Yuvraj Singh can get cancer who is considered to be fittest of all than nothing can be guaranteed. After detection of the cancer the person what goes threw the fight is like more than fighting battle. Its just by love , care and support the battle can be won.