A severe headache - May be a migrane 

A severe headache, lasting anything from two hours to two days accompanied by disturbances of vision and nausea/vomiting. A sufferer may experience only a single attack, more commonly with recurrent attacks at varying intervals.

Migraine is more common in women than in men. It may affect children as young as 3 years old. Nearly 60% of migraine sufferers have their first attack by the age of 20. If is extremely rare for migraine to appear at the age of 50. 

There is no single cause of migraine. If tends to run in families, although the exact mechanism of inheritance is not understood. A number of factors singly or in combination, may bring on an attack in a susceptible person. 

These factors may be stress related (such as anger, worry, excitement, depression, shock, overexertion, changes of routine and changes of climate) food related (particularly chocolate, cheese and other dairy products, red wine, fried food and citrus fruits), or sensory related (such as loud noise and bright light).

Menstruation and contraceptive pills may also trigger migraine.

There are two types of migrainecommon and classical. In common migraine the pain of the headache develops slowly, sometimes mounting to a throbbing pain that is made worse by slightest movement or noise. 

The pain is often, but not always on one side of the head and usually occurs with nausea and sometimes vomiting. Many sufferers particularly children, recover after they have vomited.

Classical migraine is comparatively rare. 

The headache is preceded by a slowly expanding area of blindness surrounded by a sparkling edge that increases to involve up to one half of the field of vision of each eye, disappearing after 20 minutes, followed by one sided headache, nausea, vomiting and sensitivity to light.

 Temporary weakness in one side of the body also can occur.