capitalist alienation is a significant cause/worsener of mental health issues, and he certainly did write about that (although the Solution is Revolution™ so there’s no individual solution there)
The theoretical basis of alienation is that a worker invariably loses the ability to determine life and destiny when deprived of the right to think (conceive) of themselves as the directo inr of their own actions; to determine the character of said actions; to define relationships with other people; and to own those items of value from goods and services, produced by their own labour. Although the worker is an autonomous, self-realized human being, as an economic entity this worker is directed to goals and diverted to activities that are dictated by the bourgeoisie—who own the means of production—in order to extract from the worker the maximum amount of surplus value in the course of business competition among industrialists. —Wikipedia
capitalist alienation is a significant cause/worsener of mental health issues, and he certainly did write about that (although the Solution is Revolution™ so there’s no individual solution there)
For those that need to look it up like I did…