<unk>  in medicine, is an unfavorable evolution of a disease, a health condition or a medical treatment. The disease can become worse in its severity or show a higher number of signs, symptoms or new pathological changes, become widespread throughout the body or affect other organ systems. A medical treatment, such as drugs or surgery may produce adverse effects and/or produce new health problem(s) by itself. A new disease may also appear as a<unk> to a previous existing disease. Therefore, a<unk> may be iatrogenic, i.e., literally brought forth by the physician.
Medical knowledge about a disease, procedure or treatment usually entails a list of the most common<unk> , so that they can be foreseen, prevented or recognized more easily and speedily.
Depending on the degree of vulnerability, susceptibility, age, health status, immune system condition, etc.<unk>  may arise more easily.<unk>  affect adversely the prognosis of a disease. Non-invasive and minimally invasive medical procedures usually favor less<unk>  in comparison to invasive ones.
Complication 
Defence mechanism
Withdrawal
Dislocations
Mixture
Contraindication
Perspiration
Disorder 