Medical myths are common misconceptions about health and medicine that can lead to misunderstandings and poor health choices. For example, many people believe that vaccines, such as those for measles or influenza, cause the diseases they are meant to prevent. In reality, vaccines are designed to stimulate the immune system without causing the illness. Another prevalent myth is that cracking your knuckles leads to arthritis. Research shows that this habit does not increase the risk of developing arthritis or other joint issues. Understanding the facts behind these myths can help individuals make informed decisions about their health and well-being.