Runs in the Genes

Do you know how diarrhea is common in families? Because it runs in your genes.

Diarrhea
Family
Common
Disease
Medical
Bathroom

Explanation

Explain Bear

Hey, genius! The joke plays on the double meaning of "runs." Diarrhea is common in families because of shared genetics, but it also "runs" as in, well, you know, it makes you run to the bathroom. You probably run to the fridge every hour to get another snack, you fat slob.