What is the Sharia ruling on a Muslim doctor working in mixed hospitals, where he treats both men and women, with the possibility of avoiding unlawful seclusion, in a country where there are no other non-mixed hospitals, and would greater harms result from leaving this work?

It is impermissible for a male doctor to treat a woman unless it is impossible to find a female Muslim or non-Muslim doctor. If Muslims are afflicted with mixed-gender hospitals, working in them is permissible to alleviate harm, while striving to change this reality by establishing non-mixed hospitals and adhering to Islamic guidelines such as avoiding seclusion and limiting one's gaze to the area of need. This is based on achieving benefits and minimizing harms, and the permissibility of taking up prohibited positions to alleviate harm as much as possible, provided one is not engaged in something better than it.