'Increase' can be both a countable and uncountable noun. What is the best way to determine that? For example, is it "There is increase in blood pressure" or "There is an increase in blood pressure"? Dictionaries give many examples of 'increase' as a countable noun with the article 'an'. Can you explain when I can use 'increase' as an uncountable noun without an article or helper words (some, great deal of)?

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    Increase, when uncountable, means growth. When countable, it means a measurable amount by which something is increased. Blood pressure, for example, is measured in millimetres of mercury. So you can say an increase of 10 mm Hg. Jan 15 at 13:36

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