Acute
New onset; likely concerning.
Acute on chronic
new exacerbation of a chronic condition
Chronic
Long-standing, constant
Fluctuating
Symptoms that are always present but changing in severity, never fully resolved.
Intermittent
Symptoms that are fully resolved at times, but continues to return repeatedly
Paroxysmal
Occasional, sporadic, transient.
Resolved
Gone, no longer existing
Transient
Resolving spontaneously after onset
Transient ischemic attacks