I constantly come across posts claiming to inform on signs of cancer. Many of the cancer they mention are symptomless until the very end. These posts are made to scare naive people into clicking on them. Many of the information found in these websites is made-up and false. They do nothing more than incite panic in prone minds.
My professional suggestion: for the sake of your health, keep away from these posts!
Medicine, Health, and Nutrition Fact Checker