HEADACHES

Common causes of headaches

Stress and emotional strain
Alcohol, caffeine, or other drug use or withdrawal.
Changes in the levels of chemicals in the body (neurotransmitters).
Coughing or sneezing.
Dehydration.
Dental problems or procedures, such as pain from grinding the teeth or from a root canal.
Eating or drinking cold foods and fluids.
Emotional stress.
Exposure to smoke or fumes from chemicals, including carbon monoxide.
Eyestrain.
Fever.
High altitude. Lower oxygen levels at high altitudes can cause headaches.
High blood pressure (hypertension).
Infection in the sinuses , such as sinusitis or an abscess.
Medical procedures, such as the aftereffects of a lumbar puncture (spinal tap).
Medicines. Many medicines can cause headaches.

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                                 Types of headaches

                       Tension     Cluster     Migraine