Headache can occur anywhere in the head. It can vary from sharp pain, throbbing sensation to dull ache. It may appear progressively or unexpectedly, and it can persist less than an hour or couple of days.
Headache can be located on one or both sides of your head, or is concentrated on a particular area.
Nevertheless, it is crucial to distinguish between headache that is harmless and the one which is dangerous so you would know when to visit your doctor.
Pay attention to these types of headaches:
Thunderclap headache
This headache needs seconds to minutes to reach its maximum intensity and is sudden and sharp. It is linked with many health conditions, like subarachnoid hemorrhage, which can be lethal.
Headache after injury – damage
This is also known as post-traumatic headache. It can lead to collapse and instant restorative treatment is required. Remember that even a minor head injury can cause brain damage and intracranial pressure
Headache that is more awful after waking
This condition is called morning migraine and you have to be cautious because it could indicate a presence of brain tumor. On the other hand Casilda Balmaceda, M.D, an assistant professor of Neurology at Columbia University College of Physicians and Surgeons in New York City, claims that only 8% of people who have brain tumor also suffer from morning migraine.
Worst cerebral pain of your life
This is a severe migraine which goes with vision problems, dizziness, vomiting, and nausea. When resting still, you can also experience pressure in the upper neck and head, stiff-neck, not being able to tolerate light, perplexity etc. If the symptoms do not stop all day visit your doctor.
Sudden cerebral pain
An aneurysm is an excessive localized enlargement of an artery caused by a weakening of the artery wall. Brain aneurysm frequently results in a subarachnoid hemorrhage (SAH) that is bleeding into the subarachnoid space. Unexpected symptoms can be caused when blood enters into the space around the brain, like: localized headache, blurred or double vision, dilated pupils, weakness and numbness, difficulty in speaking, pain above and behind eyes.
Unusual migraines:
A few characteristics of unordinary headache include:
• Worsens each day
• Hampers vision and speech
• Happens after activities like weight lifting, sex, or jogging
• This is the worst headache you have ever had
• With the headache you also suffer from memory loss, difficulties in moving extremities, loss of balance, and confusion
• The frequency, location, and severity changes frequently
• Headache linked with shortness of breath
• Goes along with seizures
• Those that develop after age 50
• Your headaches limit your ability to work and take part in everyday activities
• They occur with fever, nausea, or vomiting and are not linked to other health problems
Source: http://www.justnaturallife.com/how-to-recognize-which-headache-is-dangerous/