Cancer in all of its types is not contagious. A healthy person can’t “catch” cancer from someone who does have cancer. There is no evidence showing that cancer can be spread neither through physical contact (touching, kissing, and sex) nor by sharing the same food or air. Even if cancer cells make it to a healthy person’s body, the immune system is going to identify and destroy these cancer cells. Even cancer-affected women can have babies without affecting their babies. One of the only cases that have been proved to make cancer more likely is the transplant of an organ of someone who was suffering or had suffered from cancer to someone else who was not suffering from cancer. The main reason for this is that patients receiving these organs are under the influence of drugs that weaken their immune system, either way; patients go through a series of tests in order to reduce cancer risks.
Scientific studies have also shown that cancer does not spread as contagious diseases do, if that were the case, we would have witnessed cancer epidemics throughout the world. The fact that some families are more likely to suffer from cancer does not necessarily mean that they “got” cancer from their relatives. There are other reasons to explain this phenomenon. Cancer and NHL develop because the DNA in the cell mutates and changes and families share the same set of genes, making these mutations or changes more likely in people with the same genes. Families are also likely to be exposed to the same chemical responsible for cancer, resulting in diseases through the family; lastly, families are also likely to share the same routines and diets, and if these are not healthy, the chance of having similar diseases increases.
The truth is that people who have cancer need to be close to other people. It is common that family members, friends, and coworkers distance themselves from anyone suffering a disease. This can also lead to severe depression from cancer patients, resulting in a weaker immune system.
https://www.cancer.org/cancer/cancer-basics/is-cancer-contagious.html
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