Psychiatric diagnosis: 16-year-old femaleSymptoms present:
- Over familiarity (disinhibited social behaviour)
- Flight of ideas (formal thought disorder -- thoughts race and jump topics rapidly)
- Elevated mood (euphoria/expansiveness)
- Increased sexual desire (hypersexuality -- increased goal-directed activity)
- Pseudohallucinations (perceptions felt to originate from within the mind -- a psychotic feature)
Diagnosis = ManiaDifferentiating Mania vs Hypomania:
| Feature | Mania | Hypomania |
|---------|-------|-----------|
| Duration | $>7$ days | 4-7 days |
| Impairment | Marked | Minimal |
| Psychotic features | Present (can occur) | Absent |
| Hospitalisation | Often required | Not required |
Why not Schizomania: Not a DSM-5 diagnostic category; schizoaffective disorder requires concurrent psychotic and mood symptoms meeting specific criteria.
Why not Cyclothymia: Cyclothymia is a chronic, low-grade fluctuating condition with hypomanic and depressive symptoms for $>2$ years -- does not present acutely with these severe features.
Pseudohallucinations in mania = psychotic mania, which places this beyond hypomania.
\[\boxed{\text{Answer: Mania}}\]