The NHS has issued a warning over how similar flu symptoms are to a rare disorder which you need to look out for.
Many of us have kicked off the year with either a cough, a runny nose, or a fever - not exactly in the New Year's resolutions list.
Although these symptoms, which are typically associated with the flu, could also be a case of Addison's disease.
What is Addison's disease?
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Addison's disease is a rare disorder of the adrenal glands, which are the two small glands that sit on top of the kidneys, according to the NHS.
It's caused when the immune system attacks the outer layer of the adrenal glands - although it's not clear why this happens. Sometimes the adrenal glands can be damaged by tuberculosis.
"The adrenal gland is damaged in Addison's disease, so it does not produce enough cortisol or aldosterone," they explained, stating that 9,000 people in the UK are estimated to suffer from it, 'with over 300 new cases diagnosed each year'.
However, the health service warns that 'in its early stages, symptoms of Addison's disease can mimic those of other conditions, such as clinical depression or the flu'.
What are the symptoms of Addison's disease?
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While some people are likely to experience fatigue and muscle weakness, others might be in a low mood, with unintentional weight loss and a loss of appetite.
"Over time, these problems may become more severe and you may experience further symptoms, such as dizziness, fainting, cramps and exhaustion," the NHS explained.
"You may also develop small areas of darkened skin, or darkened lips or gums.
"Although these symptoms are not always caused by Addison's disease, you should see a GP so they can be investigated."
How can Addison's disease be treated?
If you have Addison’s disease, you’ll most likely need to take daily medication to replace the lost hormones.
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"In some cases, the underlying causes of Addison’s disease can be treated. For example, tuberculosis (TB) is treated with a course of antibiotics over a period of at least 6 months," the health service said.
"However, most cases are caused by a problem with the immune system that can’t be cured.
"In general, the medications used for Addison’s disease don’t have side effects, unless your dose is too high. If you take a higher dose than necessary for a long time, there’s a risk of problems such as weakened bones (osteoporosis), mood swings and difficulty sleeping (insomnia).
"Some people find that needing to take regular doses of medication is restrictive and affects their daily life or emotional health. Missing a dose of medication, or taking it late, can also lead to exhaustion or insomnia."
Anish Vij