severe accident severe accidents severe acne severe acute severe acute malnutrition severe acute respiratory severe adverse severe adverse events severe adverse reactions severe air severe allergic severe allergic reaction severe allergic reactions severe allergies severe allergy severe anaemia severe and persistent severe and prolonged severe anemia severe anxiety severe aortic severe arthritis severe asthma severe asthma attack severe asthma attacks severe attack severe autism severe back severe bacterial severe beating severe birth defects severe bleeding severe blood severe blow severe bodily severe bone severe bout severe brain severe brain damage severe brain injury severe breathing severe bruising severe burn severe burns severe car severe cardiac severe case severe cases severe casualties severe cerebral severe challenges severe changes severe chemical severe chest severe childhood severe chronic severe climate severe clinical severe cognitive severe cold severe combined severe complications severe concussion severe condition severe conditions severe congenital severe consequences severe constipation severe constraints severe crisis severe criticism severe cutaneous severe cuts severe damage severe damages severe danger severe decline severe defeat severe deficiency severe dehydration severe dementia severe dengue severe dental severe depression severe deterioration severe diabetes severe diarrhea severe diarrhoea severe difficulties severe disabilities severe disability severe disablement severe discomfort severe disease severe diseases severe distress severe drop severe drought severe droughts