Does having cancer spread to others?

In the morning, my cousin called and talked to her for a while. My cousin is 53 years old this year, and where to work is a bit old, and the job is not easy to find. Since last year, I have been working as a nanny in someone else's home, taking care of the diet and living of a grandmother who lives alone. Well done.

A few years ago, the grandmother was unwell, went to the hospital and unfortunately found out that she had kidney cancer, and began to do chemotherapy. Her cousin's brother-in-law's family told her to quit her job quickly and not to do it, saying that she was afraid of the infection of this disease and that it was not good for her health. For more than a year, my cousin and grandmother got along like mother and daughter. The grandmother is also particularly dependent on her cousin, and the cousin herself cannot bear to leave when the grandmother is ill and needs to be cared for. She was also particularly troubled and didn't know what to do.

After listening to her, I asked her what she thought, and she said that jobs at her age are not easy to find, and she also needs this job. Also particularly worried about the grandmother, a little unbearable to put down. But he is also afraid of spreading the disease to himself. I told my cousin that I thought kidney cancer should not be contagious, so I asked her to check it on Baidu herself and make her own decisions.

After getting sick, I also became particularly sensitive, knowing that breast cancer is not contagious, and quickly checked it again on Baidu. In fact, some cancers will be inherited, but they really cannot be contagious.

My heart is a little uncomfortable, will others worry about the infection when they are with themselves in the future?