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Sara Odeen-Isbister & Sonia Sharma

Seven early warning signs of cancer you should never ignore, according to experts

There are some early warning signs of cancer we should all be looking out for, according to medical experts.

Sometimes the symptoms can be "silent", which means they might not be well-known cancer symptoms and could be discounted as something else. For example being persistently bloated is usually nothing to worry about, but there's a small chance it could be a sign of gynaecological or bowel cancer, reports the Mirror.

Although it's impossible to know every type of cancer symptom, there are a seven key "silent" ones to look out for. Dr Alexandra Oliver, associate clinical director at Bupa Health Clinics (bupa.co.uk), told The Independent: “Many people are aware of the obvious signs of cancer, such as a new lump or a change to a mole.

Read More: Doctor issues stark warning on 'subtle' change that led to bowel cancer diagnosis

"However, other symptoms may be less obvious, but it’s still important that people are aware of them. In most cases, it’s likely to be nothing serious, but making sure you get checked out by a doctor if you have any symptoms, particularly persistent ones, is essential."

Here are seven of the less obvious possible signs of cancer.

Fatigue

It's perfectly normal to feel tired sometimes, and usually having a good night's sleep is enough to energise you. But Dr Oliver said that if you constantly feel tired and there isn't anything obvious causing it, it's worth mentioning it to your GP.

Night sweats

Night sweats are pretty common and can, for example, affect people taking certain antidepressants or women on their period or going through the menopause. However, Dr Oliver said some cancers such as bone cancer, leukaemia and liver cancer can also be associated with persistent night sweats.

Persistent indigestion and heartburn

Indigestion and heartburn often happen after eating certain types of food, such as high fat dishes or if a person is overweight, smokes or is pregnant. Dr Oliver said, however, that if you're experiencing persistent, regular acid reflux it might be due to gastroesophageal reflux disease, a hiatus hernia, oesophageal cancer or stomach cancer. She recommends speaking to a doctor if this happens.

Long-lasting mouth ulcers

Lots of people get mouth ulcers that can be painful but usually go away on their own. They tend to be caused by poorly fitted dentures, erupting wisdom teeth, medication, infections, dietary deficiencies or damage caused by brushing. But dentist Susie Lloyd, from Bupa Dental Care, said if a mouth ulcer hasn't healed after three weeks you should seek help as it could be mouth cancer.

Persistent hoarseness

Hoarseness can be caused by a dry or sore throat or overusing your voice. However, Dr Oliver said that if it lasts 10 days or more speak to your GP, as there's a chance it could be a serious underlying medical condition, such as laryngeal cancer.

Persistent bloating

Bloating, like indigestion and heart burn, is very common and often down to what you've eaten, especially if you have a condition such as irritable bowl syndrome (IBS). But there is a small chance bloating is a sign of gynaecological or bowel cancer. If you start to feel persistently bloated and haven't before, visit your doctor. You can find out more about cancer symptoms on the NHS website.

Persistent cough

Coughs are very normal and tend to go away on their own within three weeks. But if you have a cough that persists longer than this, go see your GP said Dr Oliver, as there's a small chance it's lung cancer.

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