1. It is not illegal to get married by concealing medical history. If the hidden disease is a disease that is legally prohibited from getting married, the marriage is invalid. If it is not a statutory condition prohibiting marriage, it cannot be confirmed that the marriage is invalid, but it should be taken as a reason for the disharmony of feelings caused by dishonest behavior before marriage, and a lawsuit should be brought to the court to ask the court to decide on divorce.

2. Legal basis: Article 1053 of the Civil Code of People's Republic of China (PRC).

If one party suffers from serious illness, it shall truthfully inform the other party before marriage registration; If it fails to tell the truth, the other party may request the people's court to cancel the marriage. A request for the annulment of a marriage shall be made within one year from the date when he knows or should know the reasons for the annulment.

Article 1052

If the marriage is coerced, the coerced party may request the people's court to cancel the marriage.

The request for dissolution of marriage shall be made within one year from the date of termination of coercion.

If the party whose personal freedom is illegally restricted wants to dissolve the marriage, it shall do so within one year from the date of restoring personal freedom.

Second, whether the marriage that conceals the history of mental illness is effective.

A marriage that conceals a history of mental illness is invalid. If he is ill and unfit for marriage, he is forbidden to get married. In addition, if you have a disease that is medically unsuitable for marriage before marriage and you are not cured after marriage, it is an invalid marriage.