. 2021 Jul 21;22(1):78. doi: 10.1186/s10194-021-01265-z

Table 4.

ICHD-3 diagnoses [81] to be recognized at level 1 (from [29], updated from [28])

Primary headache disorders	Secondary headache disorders
1.1 Migraine without aura^a 1.2 Migraine with aura^a 1.2.3 Typical aura without headache^a 2.1 Infrequent episodic tension-type headache^a 2.2 Frequent episodic tension-type headache^a 2.3 Chronic tension-type headache 3.1.1 Episodic cluster headache 3.1.2 Chronic cluster headache	5.2.1 Chronic post-traumatic headache attributed to moderate or severe head injury 6.2.2 Headache attributed to subarachnoid haemorrhage 6.4.1 Headache attributed to giant cell arteritis 7.2 Headache attributed to low cerebrospinal fluid (CSF) pressure 7.4.1 Headache attributed to increased intracranial pressure or hydrocephalus caused by neoplasm 8.2 Medication-overuse headache^a 9.1 Headache attributed to intracranial infection 10.3 Headache attributed to arterial hypertension 11.3.1 Headache attributed to acute glaucoma 13.1.1 Classical trigeminal neuralgia

Primary headache disorders

Secondary headache disorders

1.1 Migraine without aura^a

1.2 Migraine with aura^a

1.2.3 Typical aura without headache^a

2.1 Infrequent episodic tension-type headache^a

2.2 Frequent episodic tension-type headache^a

2.3 Chronic tension-type headache

3.1.1 Episodic cluster headache

3.1.2 Chronic cluster headache

5.2.1 Chronic post-traumatic headache attributed to moderate or severe head injury

6.2.2 Headache attributed to subarachnoid haemorrhage

6.4.1 Headache attributed to giant cell arteritis

7.2 Headache attributed to low cerebrospinal fluid (CSF) pressure

7.4.1 Headache attributed to increased intracranial pressure or hydrocephalus caused by neoplasm

8.2 Medication-overuse headache^a

9.1 Headache attributed to intracranial infection

10.3 Headache attributed to arterial hypertension

11.3.1 Headache attributed to acute glaucoma

13.1.1 Classical trigeminal neuralgia

^aManagement of most of these should be within the competence of level 1