One disease that causes frequent , worldwide epidemics is influenza , or flu for short . The symptoms of influenza include headache and sometimes a runny nose . Some victims get sick to their stomachs . These symptoms are similar to symptoms of other , milder diseases , especially for pregnant women , people over sixty - five , and people already suffering from another disease , such as heart problems . About half of all flupatients have a high body temperature , called a fever . Flu is very contagious . One person catches the flu from another person , it doesn’t begin inside the body as heart disease does .
One disease that causes frequent , worldwide epidemics is influenza , or flu for short . The symptoms of influenza include headache and sometimes a runny nose . Some victims get sick to their stomachs . These symptoms are similar to symptoms of other , milder diseases , especially for pregnant women , people over sixty - five , and people already suffering from another disease , such as heart problems . About half of all flupatients have a high body temperature , called a fever . Flu is very contagious . One person catches the flu from another person , it doesn’t begin inside the body as heart disease does .
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