What is the differential diagnosis for a 54‑year‑old woman with a long‑standing history of tension‑type headaches and occasional migraines who now has early‑morning headaches that awaken her, accompanied by unilateral neck tenderness and retro‑orbital pain, and who is being treated with celecoxib and Excedrin (acetaminophen, aspirin, caffeine) and occasionally a calcitonin‑gene‑related peptide (CGRP) monoclonal antibody?

Differential Diagnosis for Early Morning Headaches with Neck Pain and Retro-orbital Features

This presentation most likely represents cervicogenic headache, medication-overuse headache (MOH), or a transformation of her baseline migraine pattern, with cervicogenic headache being the leading consideration given the prominent neck tenderness, unilateral presentation, and early morning awakening pattern.

Primary Differential Considerations

1. Cervicogenic Headache (Most Likely)

The clinical presentation strongly suggests cervicogenic headache based on several key features 1:

• Early morning awakening with headache (distinct from typical migraine timing)
• Prominent neck pain and tenderness as a primary feature
• Unilateral presentation that can switch sides (though cervicogenic typically remains ipsilateral)
• Retro-orbital pain accompanying the neck symptoms
• Age 54 (cervicogenic headache prevalence increases with age-related cervical pathology)

Key distinguishing features from migraine: Cervicogenic headache is provoked by cervical movement rather than posture alone, and typically presents with reduced cervical range of motion and myofascial tenderness 2. The early morning awakening pattern is particularly suggestive, as this differs from typical migraine which more commonly occurs later in the day.

Critical caveat: Before confirming cervicogenic headache, you must exclude cervical arterial dissection given the unilateral neck pain and retro-orbital pain pattern. This is a potentially life-threatening condition that can present similarly 1.

2. Medication-Overuse Headache (MOH)

This patient is at high risk for MOH given her regular use of Celebrex, Excedrin (which contains caffeine, aspirin, and acetaminophen), and CGRP therapy 3.

MOH diagnostic criteria include:

• Headache occurring ≥15 days per month
• Regular overuse of acute headache medication for >3 months
• Development from overuse of acute medication to treat migraine attacks 3

The combination of caffeine-containing Excedrin with frequent CGRP use is particularly concerning for medication overuse 4. The FDA label for Excedrin specifically warns against use in patients with "daily headaches" 4.

Important distinction: MOH commonly develops from and coexists with chronic migraine, making the two disorders difficult to separate 3.

3. Chronic Migraine Transformation

Her baseline migraine pattern may be transforming to chronic migraine, which can present with:

• Daily or near-daily headaches
• Loss of typical migraine features (nausea, photophobia, phonophobia become less prominent)
• Headaches that more closely resemble tension-type headache 5
• Response to CGRP therapy (though incomplete) 6, 7

The fact that CGRP therapy provides some relief supports a migraine component 6, 7, 8, though CGRP monoclonal antibodies show variable efficacy in daily headache patterns 7.

4. Spontaneous Intracranial Hypotension (SIH)

While less likely, SIH must be considered given:

• Early morning/awakening headaches
• Neck pain as a prominent feature
• Age and female sex

However, key features argue against SIH:

• SIH typically presents with orthostatic headache (absent or mild on waking, worsening within 2 hours of upright posture, improving >50% within 2 hours of lying flat) 2
• Her headaches wake her from sleep, which is atypical for SIH
• SIH headaches improve with lying flat; hers require medication 2

5. Secondary Headache Disorders Requiring Urgent Evaluation

Red flags that would mandate immediate neuroimaging (MRI preferred over CT) 3:

• New headache pattern in a 54-year-old (age >50 is a red flag) 9, 10
• Awakening from sleep (potential red flag for increased intracranial pressure)
• Unilateral neck pain with retro-orbital pain (consider dissection)

Specific secondary causes to exclude:

• Cervical arterial dissection (vertebral or carotid) - requires CTA or MRA neck 1
• Giant cell arteritis (age >50, new headache, neck/temporal tenderness) - requires ESR/CRP and temporal artery evaluation
• Intracranial mass or increased ICP (awakening headaches, progressive pattern)
• Cervical spine pathology (osteophytes, disc herniation causing nerve root compression) 1, 10

Diagnostic Approach Algorithm

Step 1: Exclude Life-Threatening Secondary Causes

• Obtain MRI brain without and with contrast (age >50 with new headache pattern is an indication) 3, 9
• Consider CTA or MRA neck if any concern for arterial dissection (unilateral neck pain + retro-orbital pain) 1
• Check ESR/CRP to screen for giant cell arteritis (age 54 is borderline but reasonable)
• Cervical spine MRI if neck symptoms are prominent and suggest radiculopathy 1, 10

Step 2: Assess for Medication Overuse

• Document frequency of Celebrex, Excedrin, and CGRP use
• If using acute medications ≥10 days/month (for triptans/CGRP) or ≥15 days/month (for simple analgesics), MOH is likely 3
• Excedrin contains caffeine - assess total caffeine intake as this contributes to MOH risk 4

Step 3: Evaluate for Cervicogenic Features

• Physical examination: Assess cervical range of motion, myofascial tenderness, provocation with cervical movement 2
• Key question: Is headache provoked by neck movement (cervicogenic) or by posture/time of day (other causes)? 2
• If cervicogenic features are present, consider cervical spine imaging and potentially interventional diagnostic procedures 1

Step 4: Characterize Headache Pattern

• Use headache diary to document frequency, timing, associated symptoms 3
• Apply ICHD-3 criteria to determine if chronic migraine criteria are met (≥15 headache days/month with ≥8 migraine days/month) 11

Management Implications

If Medication Overuse Headache:

• Discontinue overused medications (Excedrin, frequent CGRP use)
• Bridge therapy may be needed during withdrawal period
• Preventive therapy should be optimized 11

If Cervicogenic Headache:

• Physical therapy targeting cervical musculature 11
• Interventional procedures (nerve blocks, facet injections) for diagnosis and treatment 1
• Address underlying cervical pathology if identified

If Chronic Migraine:

• CGRP monoclonal antibodies are first-line preventive therapy 8
• However, her partial response suggests either inadequate dosing, coexistent MOH, or alternative diagnosis 7
• Consider switching CGRP agents or adding alternative preventive therapy 11, 8

Critical Clinical Pitfalls

1. Do not assume this is simply migraine progression without excluding secondary causes - age >50 with new headache pattern mandates imaging 9, 10

2. Do not overlook medication overuse - the combination of Celebrex, Excedrin (with caffeine), and CGRP therapy creates high MOH risk 3, 4

3. Do not miss cervical arterial dissection - unilateral neck pain with retro-orbital pain requires vascular imaging 1

4. Recognize that awakening headaches are a red flag - this pattern suggests increased intracranial pressure, sleep apnea, or other secondary causes that require investigation 9

5. The response to CGRP therapy does not exclude other diagnoses - CGRP agents can provide partial relief in various headache types 7, 8