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Digestive complaints such as constipation, diarrhoea, heartburn and bloating are very common and usually treatable with lifestyle measures and over-the-counter remedies.
Around 40% of people have at least one digestive symptom at any one time, according to Dr Anton Emmanuel, consultant gastroenterologist at University College Hospital in London.
The most common are:
"Most digestive problems are to do with lifestyle, the foods we've eaten, or stress. Which means that taking steps to change your lifestyle can help, and often prevent, many of these problems," said Dr Emmanuel.
"There's a wide choice of pharmacy remedies for heartburn, indigestion and similar problems that are very good for the short-term relief of symptoms", he added.
Certain medicines that your doctor may have prescribed for you for other health conditions can lead to side effects that may upset your tummy and cause indigestion, diarrhoea or constipation.
Avoid aspirin and medicines used to treat arthritis , known as non-steroidal anti-inflammatory drugs (NSAIDs) , if you have an ulcer or you get indigestion. Consult your doctor if you rely on these medicines and are also prone to indigestion or ulcers. Paracetamol is a useful alternative.
Certain tranquillisers, painkillers, iron tablets and cough medicines can cause constipation and some people get diarrhoea while taking antibiotics or blood pressure pills.
Always tell your doctor if your prescribed medicines are upsetting your tummy.
Digestive symptoms are usually harmless and often settle down by themselves but sometimes they don't go away and can be a signal of serious illness.
Dr Emmanuel advised anyone who has taken a pharmacy remedy for a digestive problem for two weeks with no improvement to see their doctor.
He also highlighted five symptoms, which mean you should see a doctor straight away. These symptoms may be an alarm warning of a serious digestive illness:
Important: Our website provides useful information but is not a substitute for medical advice. You should always seek the advice of your doctor when making decisions about your health.