Have a blocked nose itchy throat and fever? Instead of reaching for that pill or cough syrup you could try using natural remedies to help ease the situation. A good remedy for a cough and cold or flu is eucalyptus oil. Extracted from the eucalyptus tree this oil has a number of health benefits including powerful anti bacterial anti fungal anti septic astringent antispasmodic analgesic (pain killing) and expectorant properties. Studies have found that eucalyptus oil helps increase circulation in the body increases the number of phagocytes (cells that destroy bacterial cells) helps expel phlegm and decongests the airways.