What is the science behind headache?

             There are different types of headache:-

TENSION HEADACHE:-
Tension headaches are the most common form of primary headache. Such headaches normally begin slowly and gradually in the middle of the day.

The person can feel:

as if they have a tight band around the head

a constant, dull ache on both sides

pain spread to or from the neck

MIGRANE:-

A migraine headache may cause a pulsating, throbbing pain usually only on one side of the head. The aching may be accompanied by:

blurred vision

light-headedness

nausea

sensory disturbances known as auras

REBOUND HEADACHE:-

Rebound or medication-overuse headaches stem from an excessive use of medication to treat headache symptoms. They are the most common cause of secondary headaches. They usually begin early in the day and persist throughout the day. They may improve with pain medication, but worsen when its effects wear off.

Along with the headache itself, rebound headaches can cause:

neck pain

restlessness

a feeling of nasal congestion

reduced sleep quality

CLUSTER HEADACHE:-

Cluster headaches usually last between 15hours to 30 hours , and they occur suddenly once per day up to eight times per day for a period of weeks to months. In between clusters, there may be no headache symptoms, and this headache-free period can last months to years.

The pain caused by cluster headaches is:

one-sided severe often described as sharp or burning

typically located in or around one eye.