1. Acute illnesses are those that will eventually resolve without any medical supervision (colds, teething).
2. Chronic illnesses are more serious illnesses that require medical supervision (like Tuberculosis or Cancer). 
1 5 1
acute disease - those type of disease which last for short period of time and they are not effect our body more . total recover over the body is sure . e.g.commomcold

chronic disease - disease which lasts for long period and they are effect our body . total recovery of body is not sure .
  e.g t.b.