Although<unk>  is classified as a primary<unk>  syndrome, it must be remembered that a number of important conditions can present with a<unk> -onset persisting<unk> , and these must be excluded prior to making a diagnosis of a primary<unk>  disorder. The diagnosis is one of excluding the many secondary types or<unk>  mimics, which is especially critical early in the course of the disease when a secondary etiology is more likely.<unk>  mimics include but are not limited to: * neoplasms * subarachnoid hemorrhage * idiopathic intracranial hypertension * temporal arteritis * chronic subdural hematoma * post-traumatic<unk> s * sphenoid sinusitis * hypertension * spontaneous cerebrospinal fluid leak * cervical artery dissections * pseudotumor cerebri without papilledema * cerebral venous thrombosis * Chiari malformation *<unk>  with medication overuse<unk>  Many doctors state that the condition is best viewed as a syndrome rather than a diagnosis. Once a diagnosis of<unk>  is made, clinicians argue that patients are best managed according to the more detailed pathophysiology-based diagnosis than lumped together into a single group, since a single disorder is unlikely to exist.<unk>  is classified as a Primary<unk>  Disorder by the ICHD-2 classification system (by the IHS) using number 4.8. It is one of the types of primary<unk>  syndromes that present as a chronic<unk><unk> , which is a<unk>  present for more than 15 days a month for more than 3 months. ICHD criteria The ICHD diagnostic criteria are: #<unk>  that, within 3 days of onset, fulfils criteria 2-4 #<unk>  is present<unk> , and is unremitting, for > 3 months # At least two of the following pain characteristics: ## bilateral location ## pressing/tightening (non-pulsating) quality ## mild or moderate intensity ## not aggravated by routine physical activity such as walking or climbing # Both of the following: ## no more than one of photophobia, phonophobia or mild nausea ## neither moderate or severe nausea nor vomiting # Not attributed to another disorder Notes: #<unk>  may be unremitting from the moment of onset or very rapidly build up to continuous and unremitting pain. Such onset or rapid development must be clearly recalled and unambiguously described by the patient. Otherwise it is coded as 2.3 chronic tension-type<unk> . # History and physical and neurological examinations do not suggest any of the disorders listed in groups 5-12 (including 8.2 medication overuse<unk> s and its subforms), or history and/or physical and/or neurological examinations do suggest such disorder but it is ruled out by appropriate investigations, or such disorder is present but<unk>  does not occur for the first time in close temporal relation to the disorder. Criteria revision Although the original Silberstein–Lipton criteria and the original description by Vanast make no suggestion for the exclusion of migrainous features in<unk> , the current ICHD criteria exclude patients with migrainous features. When migraine features are present, classification thus becomes problematic. It has been reported that migraine symptoms may be present in over 50% of<unk>  patients. The current criteria definition thus excludes more than half of patients with<unk>  onset of<unk><unk> . This exclusion due to migrainous features could have adverse scientific, diagnostic, and treatment consequences. One proposal for reclassification of the criteria is from a study conducted on retrospective analysis of the records of 1348 patients regularly treated at the<unk>  clinic of the Department of Neurology of Santa Casa de São Paulo, Brazil, and would be the following subdivision:<unk>  with migraine features and without migraine features that would allow the inclusion of all individuals present who has a<unk>  and<unk><unk>  from the beginning. Another proposed reclassification of the criteria is from a study conducted as a retrospective chart review of patients seen at the<unk>  Center at Montefiore Medical Center in Bronx,<unk>  York, from September 2005 to April 2009. The revised criteria for<unk>  definition does not exclude migraine features <unk> -R), and three subdivisions were created and described based on prognosis: Persisting, remitting, and relapsing–remitting. Additionally, this revised criteria would not include parts C or D currently required by the ICHD diagnostic criteria for<unk> .
New daily persistent headache
Chronic subjective dizziness
symptoms of Migraine
symptom of Migraine
Long-term depression
Headache attributed to a substance or its withdrawal
Acute visual loss
symptom of Cluster headache