This is especially likely to happen when travelling in an enclosed space such as a car, where you tend to focus on a nearby object - the eyes tell your brain the environment is stationary, while your balance organs say it is not. "This triggers motion sickness when the brain receives conflicting messages from the eyes that do not match the degree of movement detected by the inner ears," she says. Dr Brewer explains that motion sickness is due to excessive and repetitive stimulation of motion-detecting hair cells in the inner ear. Many people find that motion during travelling, particularly by plane, car or aeroplane, can bring on a bout of sickness. "In most cases, it is mild and doesn't need any specific treatment, but in rarer instances, some women might experience severe pregnancy sickness, called hyperemesis gravidarum, which might require specialist treatment or medical support." "Many women have nausea and vomiting during the first 12 weeks of pregnancy," explains Powles. Contrary to what the name suggests, it can affect you at any time of the day or night, and some pregnant women feel sick all day long. Nausea and vomiting in pregnancy, often known as morning sickness, is very common during the early stages - although sickness usually won't start until the six to eight week mark. It's obvious, but still worth mentioning. "If you're worried about a particular medicine you're taking, you should always speak to a pharmacist or your GP." This is particularly common if you don't use them as advised by your pharmacist, such as taking them on an empty stomach - so always read the guidelines."Nausea or vomiting can be among these side-effects, so it's worth considering whether your sickness is linked to any medicines," says Powles. Even common pharmaceuticals can have side-effects - including the ones we take to tackle allergies or colds. Whether taken for pain, allergies or mental health issues, popping a pill can sometimes irritate the lining of the stomach. Medication can have unwanted side effects. Finding a quiet place to do some deep breathing can help hugely during moments of panic. These include leading a healthy lifestyle by eating a balanced diet and exercising regularly, looking at ways to reduce work stress and practising relaxing techniques, like meditation or mindfulness. Powles says the best initial course of action is to try making simple lifestyle changes, to help reduce your feelings of stress or anxiety. While it might feel out of control when it happens, there are lots of things we can do to manage stress and anxiety and help relieve any associated physical effects. It's usually obvious if this is the cause of your symptoms, as the nausea usually passes quickly once the feelings of fear and overwhelm settle. "This is because your body reacts to stressful or anxious situations by releasing a surge of hormones, including adrenaline and cortisol, and the imbalance can make us feel unwell," explains Dr Luke Powles, associate clinical director at Bupa (.uk). We all know that stress and anxiety can affect the body in many ways, and it's not uncommon for these things to trigger feelings of nausea or sickness. Here, medical experts explain eight unexpected things that could be causing your queasiness, plus what you can do to make it go away. "It is a non-specific symptom that can be difficult to pin down - some causes are common, while others are more rare - but any other accompanying symptoms, such as headache, dizziness, tinnitus, abdominal pain or diarrhoea, can help to determine the cause." "Nausea is a common symptom that can be triggered by a number of physical or emotional events," says Dr Sarah Brewer, medical director at Healthspan ().
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