Stroke is an embolus or bursting of a vessel, an aneurysm is vascular widening
I hope what you mean is how not to get Cancer. First thing is prevention of things that can cause Cancer . Smoking,Alcohol etc. Then if you have a family history of Cancer you should go for regular check ups. Women should go for screening of Breast and Womb Cancer periodically as advised by their GP. As a person who has been associated with Cancer patients for almost 12 years Strong mind with a stress free easy lifestyle reduces the risk of any disease. EASIER SAID THAN DONE HEY ! But there has to be a way for common people like us. The answer is MEDITATION . I have tried many but found out that Buddhist Meditation is the best. But for this you must find a true Buddhist Monk . He will not accept money or any thing. Then read Theravada Buddhist Philosophy . Again an accidental discovery consequent to Meditation. Mind you NOT THE RELIGION. This will take care of almost all of your problems. This is so powerful that I have seen patients with Brain Cancer who was given weeks to live hang out and still living for years