Sims Deluxe Edition crisis

[Cassie]

I think it is called a cold, which moves onto flu if your Sim doesn't 'relax.'

And also, my Sim died from coughing to death, too. I was shocked.

Anyway, to answer the OP's question (even though it has already been answered several times), no, your Sim is not dying. Just make him relax for several hours (or days) and he should be right as rain.