Pathogenic or infectious diseases are caused when the body is invaded by external infectious agents or pathogens such as viruses, bacteria, parasites, or fungi. These harmful agents can be present in water, soil, and air. Humans can acquire infections by consuming contaminated substances through drinking, eating, or touching. Bacterial pathogenic diseases include pneumonia and generator infections, while viral pathogenic illnesses encompass influenza and measles.
Both malaria and candidiasis are pathogenic diseases caused by parasites and fungi, respectively. Conversely, deficiency diseases result from insufficient intake or challenges in digesting, absorbing, or utilizing necessary nutrients such as minerals and vitamins. These nutritional diseases are often associated with prolonged malnutrition.
align="justify">Excessive intake of certain nutrients can lead to deficiency diseases like scurvy and rickets. On the other hand, hereditary or genetic disorders arise from abnormalities in an individual's genome or genetic material. These disorders are inherited within the same family over generations and passed down from parent to child. A well-known example of a hereditary disease is cystic fibrosis, which tends to affect males more frequently.
Physiological diseases are the result of organ dysfunction or alterations in cellular structures that occur over time, leading to illness. Diabetes and Crohn's Disease are examples of such illnesses. Physiology encompasses the activities of cells, organs, and tissues within the human body. Any deviation from normal physiology can potentially affect multiple bodily functions.
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