A disease may be a particular abnormality that negatively affects the structure or function of all or a part of an organism, which isn't thanks to any immediate external injury. Diseases are often known to be medical conditions that are related to specific signs and symptoms
A secondary disease may be a disease that's a sequela or complication of a previous , causal disease, which is mentioned because the primary disease or just the underlying cause . for instance , a bacterial infection are often primary, wherein a healthy person is exposed to bacteria and becomes infected, or it are often secondary to a primary cause, that predisposes the body to infection
