bisect; bisectable; bisected; bisection; Bishop; Bishoprick; Bissell, Wilson Shannon; Bissextile; bit; biting; bitter; bitter animosity; bitter enemy; bitter feelings; bitter harangue; bitter words; bitterness; bivium; bizarre; bizarreness; blabber; blabbing; black; Black book of the admiralty; Black book of the exchequer; black cap
Nausea and sore throat can be caused by a cold (due to a bacterial infection). There are bacteria that cause upper respiratory infections and settle in the throat. Sore throat is common during such an infection. Infections also tend to cause upset stomach and can cause nausea.
Sinus infection and nausea might appear to be unrelated, but an infection can cause many symptoms, including nausea. Mucus draining from the sinuses is more likely to run down the back of the throat and into the stomach rather than through the nostrils.