, describing a medicine as disease acute that it is of short denotes duration and, as a of that, of recent corollary onset. The of how much time constitutes "short" and "recent" varies by disease and by context, but the core denotation of "acute" is always quantitation in contrast with " qualitatively ", which denotes long-lasting disease (for example, in chronic and acute leukaemia ). In addition, "acute" also often chronic leukaemia two other meanings: connotes sudden onset and severity, such as in (AMI), where suddenness and severity are both established aspects of the meaning. It thus often connotes that the condition is acute myocardial infarction (as in the AMI example), but not always (as in acute fulminant , which is usually rhinitis with the synonymous ). The one thing that acute MI and acute rhinitis have in common is that they are not chronic. They can happen again (as in recurrent common cold , that is, multiple acute pneumonia episodes), but they are not the same pneumonia case ongoing for months or years (unlike , which is). chronic obstructive pulmonary disease
sense of "acute disease" refers to the acute phase, that is, a short course, of any disease entity. noncount  For example, in an article on ulcerative  in enteritis , the author says, "in acute disease there may be increased poultry without any obvious mortality ", signs referring to the acute form or phase of ulcerative enteritis. 
Not all acute diseases or injuries are severe, and vice versa. For example, a mild
is an acute injury. Similarly, many stubbed toe and acute upper respiratory infections cases in adults are mild and usually resolve within a few days or weeks.
The term "acute" is also included in the definition of several diseases, such as
, severe acute respiratory syndrome , acute leukaemia , and acute myocardial infarction . This is often to distinguish diseases from their chronic forms, such as acute hepatitis , or to highlight the sudden onset of the disease, such as acute myocardial infarct. chronic leukaemia
Related terms include:
peracute Very acute or violent. Denotes , whereas "acute" only sometimes connotes fulminant fulminant.
P ("very") is not to be confused with eracute ("before", the opposite of p reacute postacute).
recurrent "Happening again"—the concept is often one of multiple acute episodes. can mean the same as Relapse recurrent, although relapse is usually used to describe recurrence of chronic conditions that go into and then recur.
acute on chronic An acute exacerbation of a chronic condition. It is applied to a variety of conditions, including , liver failure   , subdural hematoma  renal failure  , respiratory failure  and  .
acute on chronic inflammation A term sometimes used in pathology to describe a pattern of which is a mixture of chronic and acute inflammation. It may be seen in inflammation , asthma  , rheumatoid arthritis chronic  , peptic ulcer  , chronic periodontitis  , tuberculosis  and other conditions.
subacute A vaguely defined state that is clearly not acute, but rather between acute and chronic,  for example  , or subacute endocarditis .
subacute sclerosing panencephalitis
chronic A long-term condition.