Complex Diseases - GCSE Biology Definition

Complex diseases are illnesses caused by a mix of different factors, such as genes, environment, and lifestyle, rather than a single, easy-to-identify cause like bacteria or viruses. These diseases, such as heart disease, diabetes, and some types of cancer, are often influenced by multiple genes that may make a person more likely to get the disease, but they're also affected by things like diet, exercise, smoking, and stress. Because of these many factors, complex diseases can be difficult to predict, prevent, and treat. In GCSE Biology, understanding complex diseases involves learning about how genes and environmental factors work together to affect human health.