What is the ruling on informing a fiancé that his fiancée carries the genetic Huntington's disease gene, which manifests its symptoms at an advanced age, and what are the resulting pros and cons of doing so?

"Huntington's disease" is a rare, fatal, hereditary neurological disorder that affects the brain and leads to the progressive degeneration of its cells. There is currently no cure for it, and treatments focus on alleviating symptoms.

It is necessary to inform the suitor of any defect that might cause one spouse to be repulsed by the other. The female doctor must inform the woman of the test result and that she is afflicted with the disease. She should be advised to inform the suitor, or to apologize for not completing the marriage if she does not wish to disclose the illness. If there is a 50% chance of the children being affected, there is no sin upon her in marrying after informing the suitor and taking measures to prevent conception.

The female doctor is not required to inform the suitor of the illness; rather, it is not permissible for her to do so, in order to preserve the patient's privacy, unless she is asked for a medical report for the suitors, or if the suitor directly asks her.