Yes, mental illness can become a ground for divorce in Chennai under Section 13(1)(iii) of the Hindu Marriage Act, though the statutory threshold is specific and relatively high, requiring that the spouse has been suffering from a mental disorder of such a kind and to such an extent that the petitioner cannot reasonably be expected to live with the affected spouse, rather than simply the existence of any mental health condition being automatically sufficient.

The law specifically requires establishing either that the spouse suffers from a mental disorder including schizophrenia, or is suffering from mental illness so persistent or recurrent that the affected spouse's condition genuinely and substantially prevents normal cohabitation, and courts examine expert psychiatric testimony alongside evidence of how the condition has actually manifested in the marital relationship. Simple diagnosis of a manageable, appropriately treated condition generally does not meet this threshold.

To establish this ground, medical evidence is essential, typically including psychiatric evaluation reports, treatment history, and expert testimony explaining the nature, severity, and impact of the condition on the marital relationship and the petitioner's ability to continue cohabiting with the affected spouse. Chennai courts approach this ground with considerable sensitivity, recognising the stigma historically associated with mental illness.

Given the sensitive and evidentially demanding nature of this ground, it is essential to approach such cases with both compassion and careful legal preparation. Consulting the team at Aapka Legal Advice can help you navigate this sensitive ground appropriately, whether pursuing or defending against such a petition.

Given the complexity and sensitivity involved, obtaining a second opinion from a retired judge on the strength of your specific evidence can help you approach this difficult matter with appropriate care. Chennai's experienced divorce lawyers and retired judges are available through Aapka Legal Advice's Chennai divorce lawyer directory, regularly assisting clients with these sensitive matters.

In conclusion, mental illness can indeed serve as a ground for divorce in Chennai, but only where the condition meets the specific statutory threshold of severity, making thorough medical evidence and sensitive legal handling essential.