Why is there no catagory for those people returning from the hellish war, with "Spinal Cord Injury" (SCI-D) on the "answers"..?

Because we already have categories that cover that in either military or health.

That's too specific and could be placed in the military section or people with disabilities. Yahoo has never updated or changed the categories on this site.

There are some that would be suitable. In addition to ones already suggestion, Health>General Health Care>Injuries is another option. Since this isn't a chat forum, but a place to come and post knowledge seeking questions (and get answers) there would not be enough questions posted on any single injury or condition to warrant a separate subcategory.

There are far more potential topics than is practical to have a separate subcategory for (although MANY of the current ones need to be removed or updated).

See a chiropractor. Don't let surgeons butcher you.

Your Best bet would be Military.........(which is mostly Ninefinger, pretending to be 30 different vets )......
or one of the Health sub-categories.

I've never actually clicked on that, so have no idea what sub categories they have.

Because it wouldn't be a thriving category... & I'm sure trolls would make fun of the users who use it.

This is Yahoo Answers in 2019, use your brain.