Is Concealing Medical History Marriage Fraud? Prenup Health Clauses Explained

Leo Hsieh | Of Counsel | 10 Oct 2026

Specializes in cross-border investments, venture capital and fund structuring, corporate and commercial matters, and digital assets, with extensive experience in investment transactions, asset ownership, governance and cross-border succession.

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Today, many couples choose to undergo a premarital health check six months to a year before their wedding. This is not just about valuing each other's health, but also about preventing potential health conditions from affecting their honeymoon or family planning.

In practice, clients frequently ask us: "Can a premarital health check be included in a prenuptial agreement?" or "If my partner conceals a major illness, can a prenup protect me?" Many people avoid this topic, sometimes leading to underlying relationship tension.

In reality, the purpose of a prenuptial agreement is never to guard against or restrict the other party. Rather, it is a tool for rational communication, ensuring complete honesty before entering a marriage. When approached positively, it does not damage the relationship; instead, it becomes the most solid and reassuring foundation for a healthy marriage.

Why Include a "Premarital Health Check" in a Prenup?

By mandating health checks and the exchange of medical reports through a prenup, couples can identify potential hereditary diseases, infectious diseases, or infertility issues early on. This allows them to discuss family planning adjustments or financially and psychologically prepare for future medical expenses. It ensures both parties enter the marriage fully informed and ready to share future risks, avoiding the alienation that can arise from discovering unexpected health disparities post-wedding.

Including a health check in a prenup is not a sign of distrust. Through clear, rational, and written terms, it removes the stigma of suspicion, allowing both parties to build their family with a greater sense of security.

What If My Partner Refuses or Avoids the Topic? Should I Compromise?

When one party proposes a premarital health check or wishes to include it in the agreement, the other may react with resistance, avoidance, or even anger. In many traditional Asian cultures, health checks and prenups are easily equated with "distrust," "suspecting I am sick," or "calculation." This reaction usually stems from the fear of "unknown diseases" or the psychological discomfort of having one's privacy exposed.

Marriage is a long-term partnership lasting decades. If both parties completely avoid or refuse to communicate about major issues like "health"—which can significantly impact the family's future—it is often a red flag. It reflects how the other party might handle major crises (e.g., financial distress, parenting conflicts) in the future.

When communicating, we recommand shifting the focus to: "I want to walk further with you in a healthy state." Emphasize that this is not a unilateral demand, but something "we are doing together."

Is Concealing a Major Illness Marriage Fraud? The True Protection of a "Health Check Clause"

Legal Basis and Practical Analysis:

Under Article 997 of the Taiwan Civil Code, a person who enters into a marriage due to fraud or duress may apply to the court for an annulment within six months after discovering the fraud. However, the legal threshold for proving "fraudulent inducement into marriage" based on concealed health conditions is very high in practice.

Legal Risks and Burden of Proof:

Because the burden of proof for "annulling a marriage due to fraud" is stringent, discovering a concealed major illness after marriage often leaves the innocent party bearing the consequences, with limited grounds for annulment or compensation. Therefore, an explicit, written agreement beforehand is the most pragmatic protection.

Recommended Clause Design:

Physical health is a crucial factor in choosing a spouse. To enhance protection, we recommend specifying in the prenup that both parties must undergo a health check at a qualified medical institution and exchange the full reports before the wedding. Crucially, it must state: "Both parties warrant that, upon signing this agreement, they are not intentionally concealing any physician-diagnosed major illness, infectious disease, or familial hereditary disease."

Special Considerations for Cross-Border Prenups

For transnational couples (e.g., involving US, UK, or European citizens), drafting health clauses requires extreme caution, as the intersection of medical privacy and family law creates unique legal pitfalls:

Strict Medical Privacy Laws (HIPAA / GDPR):

In Western jurisdictions, medical records are highly sensitive personal data. If an agreement forcefully requires the disclosure of medical records without a properly drafted, legally compliant "Medical Information Release/Waiver," the clause may be deemed a violation of local mandatory privacy laws.

Public Policy and Unconscionability:

If a clause penalizes a spouse for falling ill (e.g., stipulating that a spouse diagnosed with a severe illness forfeits spousal support or property rights), common law courts will almost certainly strike it down as "unconscionable" or contrary to public policy, which could potentially invalidate the entire agreement.

Rational Romance: Drafting a Prenup that Balances "Privacy" and "Honesty"

A premium prenuptial agreement is never designed to force the other party to reveal all their cards, but to achieve a perfect balance between "respecting personal privacy" and "maintaining marital honesty." JunLing International Law Firm recommends following these three steps:

Step	Drafting Focus	Practical Recommendations
1. Principle of Mutuality	Clauses must be fair.	The agreement should require "both parties" to undergo exams at a designated facility, rather than being a unilateral demand.
2. Specify Exam Items	Avoid ambiguity.	It is unnecessary to cover every minor detail. Focus on "diseases with a major impact on marital life" (e.g., infectious diseases, severe hereditary conditions, psychiatric disorders, and fertility).
3. Protect Privacy	Balance dignity and legal validity.	Parties can agree to unseal the reports together, or solely exchange core data strictly related to the marriage, keeping routine health data private.

Conclusion: Guarding Emotional Commitments with Rational Law

Including a health check in a prenuptial agreement is not the beginning of distrust; it is the ultimate expression of "taking this marriage seriously." Before signing, it is highly recommended to seek the assistance of a professional lawyer to review and draft the terms, ensuring they meet legal standards and possess substantive validity.

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