Ubuthi obukhulu ngokuyinhloko buveza izimpawu ezinjengokukhanda ikhanda, isiyezi, ubuthongo, isicanucanu, kanye nesimo esifana nokudakwa, nezimo ezinzima kakhulu eziholela ku-coma.
Ukuchayeka okungamahlalakhona kungaholela ekhanda elibuhlungu elingapheli, isiyezi, buphazamise ubuthongo, kanye nokuba sengozini evamile yokukhathala.