Colds and flu share some of the same symptoms. Colds cause more nasal problems, such as blocked nose, than flu. Fever, fatigue and muscle aches are more likely and more severe with flu.
Source: Cold or flu? @ NHS Choices
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- Common cold FAQs | Cold guide @ Boots WebMD
Excerpt: Although the flu and the common cold are both respiratory illnesses, they are caused by different viruses. Because they have similar symptoms, it can be difficult to tell them apart, but generally cold symptoms are much milder than flu.
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