In many cases, from a severe head injury but there are many other causes for comas. Also comas can be caused from lack of oxygen to the brain such as if one was to fall unconcious underwater they may...
possiblythe condition is caused by a deficiency of zinc, manganese, or choline, either one or multiple. (Deficiencies of biotin, pyridoxine, niacin, folic acid, can also be involved).
Hope this helps.
I am no doctor, but I was diagnosed with TB. I took a medicine for 6 months. You will always have the bug, but chest xrays will show that the bugs are dead! I was diagnosed in 1991...