Ptosis (from Greek πτῶσις 'falling, a fall, dropped') refers to droopiness or abnormal downward displacement of a body part or organ. Particular cases include:
- Ptosis (eyelid)
- Ptosis (chin)
- Ptosis (breasts)
- Visceroptosis, of the abdominal viscera
- Gastroptosis, of the stomach
- Nephroptosis, of the kidney