If the mucus is clear this could be a warning sign of a tumour, and definitely time for a check up.
However, if it's thick and not the usual colour this could be a sign that you're battling a sinus infection.
Scientists are appealing for more people to donate their brains for research after they die.
Life on Earth may have arrived from Mars on an asteroid, scientists have claimed.
Lunar mission scheduled at the end of 2017 could find out if beer can be brewed on the moon.
A bottle used to teach children how far litter can travel ended up on Scottish beach after 8,700-mile journey.
Confused Apple customers are finding coins in their MacBooks.
High levels of iron help prevent hearing loss, a study has claimed.
A software engineer has constructed a fingernail-sized engine made of paper and it totally works!
Conspiracy theorists claim that there is a mysterious alien based pyramid in the Antarctic.
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