In the UK, it is estimated that 3 per cent of men and 8 per cent of women suffer with the condition.

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Iron deficiency anaemia is caused by lack of iron, often because of blood loss or pregnancy.

It means there aren’t enough healthy red blood cells in the blood to carry oxygen to the body’s tissues.

Because of this it can leave sufferers tired and short of breath.

One lesser known symptom of the condition is blue lips.

“When red blood cells become low in iron, they become smaller and paler in the centre so skin also becomes paler,” Dr Marilyn Murr, of family and community medicine at the University of Texas, US, said.

However, this sign may be easier to detect in the eyes.

If the area inside your bottom eyelid is lighter than normal, she told Everyday health.

What causes anaemia?

Many things can trigger anaemia.

In women of reproductive age, periods and pregnancy are common causes of the condition.

According to the NHS, this is because the body requires more iron for your baby during pregnancy.

In men and post-menopausal women, the most common cause is bleeding in the stomach and intestines.

This type of internal bleeding can be caused by stomach ulcers, stomach cancer, bowel cancer, or anti-inflammatory drugs.

How is anaemia treated?

Treating anaemia usually involves taking iron supplements to boost the low levels of iron in your body.

You may also be recommended to eat the following foods which are good sources of iron:

• dark-green leafy vegetables, such as watercress and curly kale
• iron-fortified cereals or bread
• brown rice 
• pulses and beans
• nuts and seeds
• meat, fish and tofu
• eggs
• dried fruit, such as dried apricots, prunes and raisins