[z3n]

Flu is upper resperatory, corona is lower.

You need to hydrate to thin the mucus, or it will build up and cause pulse-ox problems.

[lepton]

You need to hydrate to thin the mucus, or it will build up and cause pulse-ox problems.

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That too, but many people who are sick with most anything tend to become dehydrated, and if feverish lose a lot of salt too.

Good general advice to drink slightly salty fluids with calories, when sick. Chicken soup is good if you have it, as it also provides fats, some vitamins, and some protein. :)