Headaches are one of the most common medical complaints; most people experience them at some point in their life. They can affect anyone regardless of age, race, and gender.

A headache can be a sign of stress or emotional distress, or it can result from a medical disorder, such as migraine or high blood pressure, anxiety, or depression. It can lead to other problems. People with chronic migraine headaches, for example, may find it hard to attend work or school regularly.
Stress: Common causes of tension headaches include emotional stress and depression as well as alcohol use, skipping meals, changes in sleep patterns, and taking too much medication. Other causes include eyestrain and neck or back strain due to poor posture.

Your environment, including secondhand tobacco smoke, strong smells from household chemicals or perfumes, allergens, and certain foods. Stress, pollution, noise, lighting, and weather changes are other possible triggers.
Illness: such as an infection, cold, or fever. They’re also common with conditions like sinusitis (inflammation of the sinuses), a throat infection, or an ear infection. In some cases, the headaches may be the result of a blow to the head or rarely, a sign of a more serious medical problem.

infection : Many infections of the nose, throat and ear can cause headache. Depending on the disorder, treatment can include medications such as antibiotics, decongestants or antihistamines. Persistent problems, such as chronic tonsillitis, may need surgery as a final resort. Consult with an ear, nose and throat specialist.

Glare : Brightness from your computer screen, sunlight or overhead lights can make things painful. Turn it down and try adding a desk lamp.

Medication : Some prescription medications may have the potential to trigger a headache. If you notice an increase, talk to your doctor.

Lack of Physical Activity : Even though over-exertion can increase your risk for headaches, staying sedentary doesn't help either. As with most things in life, moderation is key. Talk to your doctor before beginning or revising any exercise regimen.

Posture ; Your mom was right! Sit up straight to keep blood flowing (and move around when you can if you spend extended periods of time bent over a desk).

Hormones : When estrogen levels drop (especially right before your period), you may be more likely to get a headache. Keep track of your cycle and plan when you can.

Food Sensitivities : Food and drink release neurotransmitters, which can cause headaches in some people. Triggers include aspartame, caffeine, chocolate, alcohol, cheese and more.

Source​ ៖ www.webmd.com/ www.betterhealth.vic.gov.au