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Hello Rebecca. The yellow discharge from your nose could have been due to infection or chronic common cold. It is common knowledge that infection turns the secretions yellow. But a clear yellow discharge may not necessarily mean infection . Long standing cold can lead to thin yellow discharge.
Yellow snot is a sign of a cold, as it shows white blood cells are rushing to the site of the infection. Green mucus shows the immune system is fighting back as it turns that colour due to dead white blood cells.If mucus is pink or red it means the nasal tissue has become broken and is bleeding.hat your SNOT says about your health: Yellow mucus means you have a cold while black gunge is a sign of a fungal infection. 1  Most people produce about 1.7 litres of mucus a day-enough to fill a kettle. 2  As it is made from water, proteins, antibodies and salts, it should be clear.