A<unk> in medicine, or medical<unk>  is an unfavorable result of a disease, health condition, or treatment.<unk>  may adversely affect the prognosis, or outcome, of a disease.<unk>  generally involve a worsening in severity of disease or the development of new signs, symptoms, or pathological changes which may become widespread throughout the body and affect other organ systems. Thus,<unk>  may lead to the development of new diseases resulting from a previously existing disease.<unk>  may also arise as a result of various treatments. The development of<unk>  depends on a number of factors, including the degree of vulnerability, susceptibility, age, health status, and immune system condition. Knowledge of the most common and severe<unk>  of a disease, procedure, or treatment allow for prevention and preparation for treatment if they should occur.<unk>  are not to be confused with sequelae, which are residual effects that occur after the acute (initial, most severe) phase of an illness or injury. Sequelae can appear early in the development of disease or weeks to months later and are a result of the initial injury or illness. For example, a scar resulting from a burn or dysphagia resulting from a stroke would be considered sequelae. In addition,<unk>  should not be confused with comorbidities, which are diseases that occur concurrently but have no causative association.
Complication 
Meditation
Preload 
Injury
Disease cluster
Scaption
Disarticulation
Spillover 