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Published on: 4/7/2025

How Common Is Cryptic Pregnancy and What Are Its Signs?

Cryptic pregnancy is quite rare and occurs when a person is unaware they are pregnant until very late, often until delivery. Its signs are subtle, sometimes including minimal weight gain, few typical pregnancy symptoms, or irregular menstrual-like bleeding.

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Explanation

A cryptic pregnancy is when someone does not realize they are pregnant until very late in the pregnancy or even until labor begins. This condition is not common, and available studies suggest that it happens infrequently, although exact rates are hard to determine. One reason this phenomenon occurs is because the usual signs of pregnancy may be very subtle or even absent. For example, a person might not notice the typical weight gain, morning sickness, or fetal movements. In some cases, what might seem like normal cycle irregularities or mild symptoms might be mistaken for something else, leading to denial or unawareness of the pregnancy. Emotional and psychological factors can also play a role, making it even harder for some individuals to acknowledge the pregnancy. While it can be an unexpected situation, cryptic pregnancy is a recognized, though infrequent, occurrence. If you have any concerns or questions about pregnancy symptoms or changes in your body, discussing them with a healthcare provider is a useful way to get clear and personalized information.

(References)

  • Del Giudice M. The evolutionary biology of cryptic pregnancy: A re-appraisal of the "denied pregnancy" phenomenon. Med Hypotheses. 2007;68(2):250-8. doi: 10.1016/j.mehy.2006.05.066. Epub 2006 Sep 25. PMID: 16997498.

  • Chechko N, Losse E, Stickel S. A case report involving the experience of pervasive pregnancy denial: detailed observation of the first 12 postpartum weeks. BMC Psychiatry. 2022 Dec 9;22(1):774. doi: 10.1186/s12888-022-04377-1. PMID: 36494788; PMCID: PMC9732985.

  • Dunphy L, Boyle S, Coughlin L. Unexpected delivery: cryptic pregnancy. BMJ Case Rep. 2024 Nov 12;17(11):e261287. doi: 10.1136/bcr-2024-261287. PMID: 39532329.

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