This TikTok trend could prove extremely sh—y. Castor oil has been hailed as a treatment for complexion problems and hair growth, but experts are warning against an unlikely side effect when ingested.

Medically reviewed by Anju Goel, MD Key Takeaways Diarrhea is often contagious, especially when it's caused by viruses, bacteria, or parasites. Infectious diarrhea can spread by not washing hands ...