Which type of diseases does NOT spread between individuals?

Non-communicable diseases are characterized by the inability to spread from one individual to another. These diseases typically stem from a combination of genetic, environmental, and lifestyle factors. Examples include conditions such as diabetes, heart disease, and cancer. Because they do not have an infectious agent, they cannot be transferred through contact, respiratory droplets, or any other means of direct interaction between individuals. This distinction is crucial in understanding public health measures, as management strategies vary significantly between non-communicable and communicable diseases, which are diseases that can spread from person to person, such as the flu or tuberculosis. Recognizing that non-communicable diseases do not spread between individuals helps in focusing prevention and management efforts on behavior modifications and lifestyle choices rather than transmission risk reduction.