Schizotypal personality disorder
Severe acute respiratory syndrome (SARS)
Sexually transmitted diseases (STDs)
Social anxiety disorder (social phobia)
Solitary rectal ulcer syndrome
Spring and summer seasonal affective disorder (summer depression)
Staphylococcal scalded skin syndrome
Subconjunctival hemorrhage (broken blood vessel in eye)
Sudden (acute) pulmonary edema
Sudden infant death syndrome (SIDS)