Diseases prevent the body from working properly, but you might not know you have a disease until you start experiencing symptoms.
Many diseases are caused by germs, while others are caused by injuries, genes, and toxins. Diseases can also be caused by the body itself. Almost all diseases can be treated by contemporary medicine or practices including drugs, surgery, or radiotherapy.
Genetic diseases, like autism or the rare illness progeria, occur when a person inherits a gene or mixture of genes from parents who may not know that they carry these genes. In other cases, like with Duane Syndrome or Down Syndrome, a gene changes at birth and becomes abnormal.
Bodies have an advanced defense, called the immune system, for fighting germs and certain diseases. Sometimes the immune system fights the wrong parts of the body, however. For example, people can experience allergic reactions when harmless substances, like pollen and dust, provoke their immune systems. Usually, because the body becomes immune to these pathogens over time, it can better cope with later attacks of the same illnesses that earlier harmed it.
Another kind of disease is cancer, which causes cells to divide wildly and form tumors. Tumors often prohibit parts of the body from functioning properly. Carcinogens, like sunlight or tobacco smoke, are factors that can cause cancer.
Once you have a disease like these genetic illnesses, allergies, or cancer, what can you do to treat them beyond relying on your immune system? Contemporary medicine prevents and cures disease when possible. Some diseases like diabetes are untreatable, but treatments can still diminish symptoms and help those affected have better lives. Healthy lifestyles can also help preclude certain conditions such as heart disease. Furthermore, viral diseases can be avoided for the most part by keeping distance from those sharing viral illness symptoms such as sneezing and coughing.
Overall, diseases can often be unfamiliar and scary to confront, but today many of them are treatable.