A division bench of Patna High Court held as follows,

From Para 13,

13. It appears from the petition that application for divorce has been filed by the appellant under Section 13 (1) (ia) & (ib) of the Act i.e. on the ground of cruelty and desertion. However, the main ground taken for divorce is that respondent-wife is suffering from mental disease or disorder
(schizophrenia) and permanent disability in her leg and due to her abnormal behavior the appellant-husband do not like to continue the matrimonial life with respondent. The learned Trial Court in para 12 of the impugned Judgment considered this aspect and held that appellant has failed to prove that respondent is suffering from the schizophrenia disease and her leg disability. From perusal of the record the question which this court has to decide is whether the respondent is suffering from schizophrenia or other mental disorder of such a kind and to such an extent that the appellant cannot reasonably be expected to live with respondent-wife or not?

From Para 14,

14. Taking note of the evidence adduced by the appellant, it is clear that he has not proved the mental disease or disorder of the respondent-wife, as the doctor who is treating the respondent-wife has not been examined. The grounds claimed by the appellant-husband are that the respondent-wife is of unsound mind, aggressive and has deserted the appellant have not been proved from the material available on the record.

From Paras 20 and 21,

20. In view of the above pronouncement, it appears that the ground of a spouse suffering from schizophrenia, by itself is not sufficient for grant of divorce under Section 13 (1) (iii) of the Act as it may involve various degree of mental illness. The law provides that a spouse in order to prove a ground of divorce on the ground of mental illness, ought to prove that the spouse is suffering from a serious case of schizophrenia which must also be supported by medical reports and proved by cogent evidence before the Court that disease is of such a kind and degree that husband cannot reasonably be expected to live with wife.
21. Section 13(1)(iii) of the Act does not make mere existence of a mental disorder of any degree sufficient in law to justify dissolution of marriage. The contents in which the ideas of unsoundness of mind and mental disorder occur in section as ground for dissolution of a marriage, require assessment of degree of mental disorder and its degree must be such that spouse seeking relief cannot reasonable be expected to live with the other. All mental abnormalities are not recognized as grounds for grant of decree. The burden of proof of existence of requisite degree of mental disorder is on the spouse who bases his or her claim on such a medical condition.

Citations:

Other Sources:

https://indiankanoon.org/doc/146315829/

https://www.casemine.com/judgement/in/67f4c506bdfd43233228ae45

https://www.livelaw.in/high-court/patna-high-court/patna-high-court-wife-mental-disorder-divorce-schizophrenia-hindu-marriage-act-289016

https://www.indialaw.in/blog/civil/divorce-hc-schizophrenia-isnt-enough/

https://lawtrend.in/schizophrenia-allegation-alone-not-ground-for-divorce-without-proof-of-severity-affecting-marital-life-patna-high-court/

https://www.verdictum.in/court-updates/high-courts/patna-high-court/a-v-b-miscellaneous-appeal-no1152-of-2018-spouse-relief-mental-disorder-divorce-1573858

Mental Disorder Must Be Proven to Be of Severe Degree to Justify Divorce Under Hindu Marriage Act, Rules Patna High Court

Index of Divorce Judgments is here.

Analysis by Adv Talari Rajeswari