Headaches are extremely common. Nearly everyone has a headache occasionally. When they occur repeatedly, they are a symptom of a headache disorder.” ~ The World Health Organization

These are possibly type of four worst headaches and it's causes

Migraine Causes
A number of other factors can contribute to migraine headaches:

Genetics: Some 90 percent of migraine sufferers have a family history of migraine symptoms.
Stress, anxiety, depression: Not only can these factors cause muscle tension, they also can affect the way you perceive and cope with pain.
Hormonal changes—for example, changes in hormones and hormonal levels during the menstrual cycle.
Bright or flashing lights: These can trigger migraines particularly if you’re tired or have been drinking alcohol.
Hunger: It is possible that low blood sugar due to not eating might be linked to migraines.

Dehydration: It is thought that lack of fluid causes your blood volume to drop, which reduces the amount of oxygen flowing to the brain.
Fatigue that may be the result of an underlying sleep disorder, such as sleep apnea.
Bipolar disorder: Several studies link migraines to this mood disorder.
Epilepsy: People with seizure disorders are twice as likely to suffer from migraines.
Asthma. The link is thought to be due to the fact migraines and asthma both involve inflammation.
Diet: Chocolate, aged cheese, processed meats, monosodium glutamate (commonly used in Chinese food), red wine, and caffeine could contribute to headaches.
Strong odors: Sensitivity to perfume and more offensive odors (such as cigarette smoke) is more likely in migraine sufferers who also have depression.
Overexertion: Some people who suffer from migraines report that they find relief if they switch from high-intensity exercise to low-intensity exercise.
Medication overuse: Taking too many painkillers can cause migraine symptoms to flare up again once medications wear off
Changing weather: Some research suggests that thunderstorms can be migraine causes, though it isn’t clear why.

Tension Headache
A tension headache is the most common type of headache, but they aren’t as severe as migraines. You’ll feel tension headaches as constant pressure or squeezing at both sides of your head, rather than pulsing, throbbing pain at the front or just one side of your head.

Some tension headache causes are the same as for migraines. Tension headache causes can include the following factors:

Stress, anxiety, and depression
Hunger, and dehydration
Bad posture
Arthritis in the vertebrae of the neck, since the nerves that link to your scalp originate from these vertebrae.
Temporomandibular joint disorder (TMJD): This affects the jaw joints, and you may have the condition if you notice popping, clicking and/or grating sounds when you open your mouth wide (for example, during a dental exam). TMJD is more common in people who clench or grind their teeth, and in those who have arthritis. If you think your tension headache causes may include TMJD, ask your dentist to fit you with a biteguard you can wear at night.
Eye strain: This is particularly common if you work on a computer and don’t take frequent breaks. Your tension headache also may be caused by eyestrain if you are squinting due to wearing the wrong-strength glasses, so be sure to get your vision checked regularly.

Cluster Headache
These occur on a daily basis, at the same time of the day or night, with a “cluster” typically lasting for about six to 12 weeks, with periods of remission in between. Like migraine, a cluster headache may be preceded by an aura, and tend to be focused on one side of the head. Cluster headache causes include the following:

Genetics: About 20 percent of cluster headache sufferers have a family history of the condition.
A problem in the hypothalamus. This part of the brain controls many bodily functions, including your heart rate, blood pressure, temperature, appetite, and sleep cycles. Imaging tests have revealed increased activity in the hypothalamus during a cluster headache.
Tobacco use: Two-thirds of sufferers smoke, or have smoked in the past.
Nitroglycerin: This medication is used to treat heart disease.

Rebound Headaches
This type of headache is caused by headache medication overuse, and often occur first thing in the morning, since painkillers taken the night before will have worn off overnight. Rebound headache causes include these medications:

Most painkillers taken for headaches have the potential to cause rebound headaches.
Analgesics like acetaminophen (Tylenol) and medications that combine acetaminophen, aspirin, and caffeine (for example, Excedrin) carry more risk for rebound headaches than NSAIDs like ibuprofen (Advil, Motrin) and naproxen (Aleve, Naprosyn).
Other headache causes include colds and flu, sinusitis (inflamed sinuses), a head injury (always tell your doctor if you have sustained one of these), and carbon monoxide poisoning (install a carbon monoxide alarm in your home).

Credit: university of healthnews

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