Why would a person have the runs for like 7 days? is something wrong?

May deserve eval: Diarrhea >bacterial. Most cases resolve w/o treatment. Medical attention needs to be sought if: evidence of dehydration(dizzy on standing/dry mouth), blood/mucus in stool, fever >101f; severe abdominal pain, recent antibiotics (70 or with illnesses or medicines that impair the immune system or if pregnant. Are others sick too: ?Food/viral outbreak.