We can classify a disease for example according to the severity (mild, intermediate, and severe) or according to the stability (stable and non-stable) and so on. According to what we determine acute and chronic?

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    Acute and chronic refer to the expected duration of an illness. A chronic illness is one that is persistent or long lasting, while an acute illness has a shorter duration. – Nmath May 21 at 16:42
  • @nmath I'm not a doctor; is it the expected duration or the actual duration of suffering? (Admittedly this is probably off topic.) – TypeIA May 21 at 18:22
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    @TypeIA Both terms are relatively fluid and can take on slightly different meanings in context, especially when they are part of a specific medical term. ex: chronic fatigue syndrome and acute kidney failure both refer to specific diagnoses. Acute and chronic can also refer to the duration of onset (how the illness came to be). Illnesses that come on suddenly could be described as acute and those that take a long time to develop can be considered chronic. Consider the differences and similarities between chronic hypertension and acute heart failure. – Nmath May 21 at 19:26
  • @Nmath Consider posting it as an answer (with a link reference to acute/chronic duration if possible) :) – seventyeightist May 21 at 20:08

Usually they are classified under the phases or stages of a disease.

According to the phase or stage of disease: 1. Acute. 2. Chronic.

See also here: stage of the condition (https://www.physio-pedia.com/Stage_of_the_Condition)

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