Chalk is a form of limestone. Chalk poisoning occurs when someone accidentally or intentionally swallows chalk.

This is for information only and not for use in the treatment or management of an actual poison exposure. If you have an exposure, you should call your local emergency number (such as 911) or the National Poison Control Center at 1-800-222-1222.

Chalk is generally considered to be nonpoisonous, but it can cause problems if large amounts are swallowed.

• Billiard chalk (magnesium carbonate)
• Blackboard and artist's chalk (gypsum)
• Tailor's chalk (talc)

Note: This list may not include all uses of chalk.

Next Section

Chalk Symptoms

Review Date: 01/30/2010
Reviewed By: Jacob L. Heller, MD, MHA, Emergency Medicine, Virginia Mason Medical Center, Seattle, Washington. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

A.D.A.M., Inc. is accredited by URAC, also known as the American Accreditation HealthCare Commission (www.urac.org)