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Swallowing chalk

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

This article is for information only. DO NOT use it to treat or manage an actual poison exposure. If you or someone you are with has an exposure, call the local emergency number (such as 911), or the local poison control center can be reached directly by calling the national toll-free Poison Help hotline (1-800-222-1222) from anywhere in the United States.

Poisonous Ingredient

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

Where Found

Chalk is found in:

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

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

Symptoms

Symptoms may include:

Home Care

Seek medical help right away. Do not make a person throw up unless told to do so by poison control or a health care provider.

Before Calling Emergency

Get the following information:

  • Person's age, weight, and condition
  • Name of the product (and ingredients and strength, if known)
  • Time it was swallowed
  • Amount swallowed

Poison Control

The local poison control center can be reached directly by calling the national toll-free Poison Help hotline (1-800-222-1222) from anywhere in the United States. This national hotline will let you talk to experts in poisoning. They will give you further instructions.

This is a free and confidential service. All local poison control centers in the United States use this national number. You should call if you have any questions about poisoning or poison prevention. It does NOT need to be an emergency. You can call for any reason, 24 hours a day, 7 days a week.

You can also get online poison help now at Poisonhelp.org. Just enter the product, poison, or medicine to get expert help.

What to Expect at the Emergency Room

The provider will measure and monitor the person's vital signs, including temperature, pulse, breathing rate, and blood pressure. Symptoms will be treated as appropriate.

A visit to the emergency room, however, may not be needed.

Outlook (Prognosis)

How well the person does depends on the amount of chalk swallowed and how quickly treatment is received. People with kidney disease may be more affected if a very large amount of chalk is ingested. The faster the person gets medical help, the better the chance for recovery.

Chalk is considered a fairly nonpoisonous substance, so recovery is likely.

Alternative Names

Chalk poisoning; Chalk - swallowing

References

Healthy children.org website. Swallowed harmless substance. www.healthychildren.org/English/tips-tools/symptom-checker/Pages/symptomviewer.aspx?symptom=Swallowed+Harmless+Substance. Accessed November 25, 2025.

Meehan TJ. Care of the poisoned patient. In: Walls RM, ed. Rosen's Emergency Medicine: Concepts and Clinical Practice. 10th ed. Philadelphia, PA: Elsevier; 2023:chap 135.

Nelson LS, Calello DP. Acute poisoning. In: Goldman L, Cooney KA, eds. Goldman-Cecil Medicine. 27th ed. Philadelphia, PA: Elsevier; 2024:chap 96.

Theobald JL, Corcoran JN. Poisoning. In: Kliegman RM, St. Geme JW, Blum NJ, et al, eds. Nelson Textbook of Pediatrics. 22nd ed. Philadelphia, PA: Elsevier; 2025:chap 94.

Review Date 10/14/2025

Updated by: Jesse Borke, MD, CPE, FAAEM, FACEP, Attending Physician at Kaiser Permanente, Orange County, CA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.