Cluster Headache: Typical Symptoms in Adults
Cluster headache presents as severe unilateral orbital, supraorbital, or temporal pain lasting 15-180 minutes, occurring 1-8 times daily, accompanied by ipsilateral autonomic symptoms including lacrimation, conjunctival injection, nasal congestion/rhinorrhea, ptosis, eyelid edema, facial sweating, and miosis, along with restlessness or agitation 1, 2.
Core Pain Characteristics
The headache pain is:
- Strictly unilateral (one-sided only)
- Severe to very severe intensity - often described as excruciating or the worst pain imaginable
- Located around the eye (orbital), above the eye (supraorbital), or temple (temporal region)
- Duration: 15-180 minutes per attack when untreated
- Frequency: 1-8 attacks per day during active cluster periods 1, 2, 3
This is fundamentally different from migraine, which typically lasts 4-72 hours and has moderate to severe throbbing pain that worsens with activity 1.
Ipsilateral Autonomic Features (Same Side as Pain)
At least one of these autonomic symptoms must be present on the same side as the headache 1, 2:
- Lacrimation (tearing/watery eye) - most common
- Conjunctival injection (red, bloodshot eye) - most common
- Nasal congestion or rhinorrhea (stuffy or runny nose)
- Ptosis (drooping eyelid)
- Eyelid edema (swelling)
- Forehead and facial sweating
- Miosis (constricted pupil)
These autonomic symptoms are critical diagnostic features that distinguish cluster headache from other headache types 2, 3.
Behavioral Features
Restlessness or agitation is characteristic - patients typically cannot lie still during attacks and may pace, rock, or exhibit agitated behavior. This contrasts sharply with migraine patients who prefer to remain still in a dark, quiet room 2, 3.
Attack Pattern and Timing
- Episodic pattern: Attacks occur in "clusters" or "bouts" lasting weeks to months, followed by remission periods (pain-free intervals ≥3 months)
- Chronic pattern: Pain-free intervals last <3 months between bouts 4, 2
- Circadian rhythm: Attacks often occur at the same time each day, frequently waking patients from sleep 2
- Diagnostic requirement: At least 5 attacks meeting these criteria 1
Common Triggers
- Alcohol - most reliable trigger during active cluster periods
- Nitroglycerin
- Foods containing nitrates
- Strong odors or perfumes
- Changes in sleep patterns 2
Key Diagnostic Pitfalls
Do not confuse with migraine: Cluster headache lacks the photophobia/phonophobia combination typical of migraine, has much shorter duration (minutes vs hours), and features prominent autonomic symptoms 1.
Do not confuse with sinus disease: The nasal congestion and facial pain can mimic sinusitis, but the severe unilateral pain, short duration, multiple daily attacks, and other autonomic features point to cluster headache 5.
Gender consideration: While historically more common in males (2-3:1 ratio), cluster headache is increasingly recognized in women and may be underdiagnosed in this population 2, 6.