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Hey there, that's a really complex question and scientists are still working to fully understand it. There isn't one single answer, but here are some of the things they're looking at: * Environmental Factors: Exposure to pollutants, toxins, and certain chemicals in our environment has increased over the years. These things can damage our cells and immune systems, potentially leading to cancer or autoimmune issues. * Lifestyle Changes: Modern lifestyles often involve less physical activity, more processed foods, and higher stress levels. These factors can weaken our immune systems and increase inflammation in the body, making us more vulnerable to disease. * Improved Detection: It's also possible that we're simply getting better at diagnosing these conditions, so we're identifying more cases in younger people than we used to. * Changes in the Microbiome: The bacteria in our gut play a huge role in our immune system. Changes in diet and increased use of antibiotics can disrupt this balance, potentially contributing to autoimmune diseases. * Genetics: While not all cancers and autoimmune diseases are directly inherited, genetics can play a role in predisposing someone to these conditions. It's important to remember that research is ongoing, and scientists are constantly learning more about these complex diseases.