This accentuates the urgency for those diagnosed with CPH to receive an MRI head scan. Diagnosis
CPH is a long-term disease with symptoms lasting for longer than a year, either without remission or with remissions that last less than a month. In order to be diagnosed with CPH, a patient needs to have had at least 20 attacks filling the following criteria:
Attacks of severe unilateral orbital, supraorbital, or temporal pain lasting between 2 and 30 minutes. The headache needs to take place with one of the following:
Ipsilateral conjunctival injection and/or lacrimation
Ipsilateral nasal congestion and/or rhinorrhoea
Ipsilateral eyelid oedema
Ipsilateral forehead and facial sweating
Ipsilateral miosis and/or ptosis
Attacks need to occur more than five times a day for more than half of the time, although periods of lower frequency can occur. The symptoms cannot be attributed to another disorder. Attacks can be prevented completely by therapeutic doses of indomethacin.In addition, diagnosis of CPH requires that neuropathy of the supraorbital area in the temporal branch of the facial nerve be ruled out. Comparison to cluster headaches
Though outwardly similar to cluster headaches, chronic paroxysmal hemicrania is rather different, and the two headaches are not a subset of one or the other. Key differences include:

Different gender distributions – CPH is more common in women than men, with opposite occurring with cluster headaches. CPH attacks occur more frequently, but are shorter. CPH affects all over the headIndividuals with CPH are far more responsive to indomethacin than individuals with cluster headaches. CPH attacks can be provoked by neck movement.
A stye, also known as a hordeolum, is a bacterial infection of an oil gland in the eyelid. This results in a red tender bump at the edge of the eyelid. The outside or the inside of the eyelid can be affected.The cause of a stye is usually a bacterial infection by Staphylococcus aureus. The internal ones are due to infection of the meibomian gland while the external ones are due to an infection of the gland of Zeis. A chalazion on the other hand is a blocked oil gland without infection. A chalazion is typically in the middle of the eyelid and not painful.Often a stye will go away without any specific treatment in a few days or weeks. Recommendations to speed improvement include warm compresses. Occasionally antibiotic eye ointment may be recommended. While these measures are often recommended, there is little evidence for use in internal styes. The frequency at which styes occur is unclear, though they may occur at any age. Signs and symptoms
The first sign of a stye is a small, yellowish spot at the center of the bump that develops as pus and expands in the area.Other stye symptoms may include:

A lump on the top or bottom eyelid
Localized swelling of the eyelid
Localized pain
Redness
Tenderness
Crusting of the eyelid margins
Burning in the eye
Droopiness of the eyelid
Scratchy sensation on the eyeball (itching)
Blurred vision
Mucous discharge in the eye
Irritation of the eye
Light sensitivity
Tearing
Discomfort during blinking
Sensation of a foreign body in the eye

Complications
Stye complications occur in very rare cases.