Symptoms of invasive listeriosis can take three days to three months to develop and can include fever, muscle aches, confusion, stiff neck, balance problems, and seizures (convulsions).

What to do if it keeps happening It’s normal to experience a stiff neck after sleeping sometimes, but if the issue keeps recurring or you’re experiencing symptoms that radiate beyond the neck ...

Types of SPS include: Symptoms of stiff person syndrome typically develop ... such as the arms, neck, and shoulders. As the ...