Why do I feel sick? Doctors explain some of the most common causes of nausea

You’ve ruled out a hangover and food poisoning – so what’s causing that unsettled feeling in your stomach? Liz Connor asks the experts.

If you've finished off an exhausting week at work by imbibing your way through a small brewery with your colleagues on Friday night, it probably won't come as a major surprise if you're feeling slightly queasy come Saturday morning.

But what if you wake up with a delicate stomach - and you can't blame it on the booze because you haven't touched a drop? Feeling sick or nauseous is very common and experts say there are lots of causes, although it isn't always easy to get to the root of the issue.