Some

http://www.mangago.zone/read-manga/10_years_where_i_loved_you_the_most/

very sad

PTSD,

http://www.mangago.zone/read-manga/escape_from_the_night/

http://www.mangago.zone/read-manga/on_doorstep/

http://www.mangago.zone/read-manga/last_paradise/

http://www.mangago.zone/read-manga/hikizuru_oto/

- http://www.mangago.zone/read-manga/dekichatta_shitsuji/ (heart condition)
- http://www.mangago.zone/read-manga/puchitto_hajiketa/ (asthmatic)
- http://www.mangago.zone/read-manga/houyou_jikken/ (sickly and fragile)
- http://www.mangago.zone/read-manga/ano_koi_no_tsuzuki/ (weak and sickly)
- http://www.mangago.zone/read-manga/suki_da_nante_ienai/ (weak and sickly)
- http://www.mangago.zone/read-manga/koi_wa_maiorita/ (weak and sickly)
- http://www.mangago.zone/read-manga/psycho_young_dream/ (mental)
- http://www.mangago.zone/read-manga/hanazono_no_kioku/ (mental)
- http://www.mangago.zone/read-manga/bannin/ (mental and sickly)