Acute diseases - These diseases occur suddenly and last for a very short period of time, such as the common cold. It can be treated with medical treatment or on its own. Many times, acute diseases turn chronic if they continue to persist.
Chronic diseases - These diseases develop slowly in our body and may even last for a lifetime. Generally, if a disease lasts for more than three years it is called chronic disease. Initially the symptoms are very mild. A chronic disease progresses slowly and damages the body severely. It might sometimes be fatal.