Why Do Headaches Happen? Common Causes, Symptoms and Treatments

Introduction

A headache is a common problem that makes it difficult to study, work, or enjoy any activities you do. Although headaches may not be severe in most cases, sometimes they may be a cause for concern. However, knowing their cause can help you get the right treatment you need¹. In this blog, we’ll cover the common causes and symptoms of headaches, the available treatment options, and simple ways to help manage them. 

What Is a Headache?

A headache is a pain or discomfort arising from pain-sensitive structures in the head, such as the blood vessels, nerves, and the tissues covering the brain (meninges)². This pain occurs because of changes in the way the brain, nerves, and blood vessels process pain signals. It can occur in different parts of the head, scalp, or face. It may feel dull, sharp, throbbing, or like a tight band wrapped around the head. Headaches can last from a few minutes to several hours or, in some cases, even days, depending on the underlying cause. While most headaches are not serious and improve with simple treatment, some may be a sign of an underlying health condition that requires medical attention¹.

Types of Headaches

Headaches are broadly classified into primary headaches and secondary headaches, depending on whether the headache itself is the main condition or is caused by another medical problem. 

1. Primary Headaches

Headaches that occur because of changes in the pain-sensitive structures of the head or the way the brain processes pain are called primary headaches. They may not be caused by an underlying health condition. The different types of headaches (primary) include: 

• Tension Headaches: These are one of the most common type of headache. They usually cause a dull, aching pain or a feeling of tightness around the forehead or the back of the head and neck. They can last anywhere from 30 minutes to about 7 days. They may happen occasionally, frequently, or even become a long-term (chronic) problem. They usually begin around puberty and are most common in people in their 30s. These headaches are caused by several factors⁴, such as stress, poor sleep, poor posture, anxiety, and muscle strain¹. 
• Cluster Headaches: These are a rare, but an extremely painful type of headache. They cause sudden, intense pain on one side of the head, usually around one eye¹. The pain can last from 15 minutes to 3 hours⁵. These headaches occur in repeated episodes, or clusters, often at the same time each day or night and may continue for several weeks before disappearing for months. During an attack, the affected eye may become red or watery, the nose may become blocked or runny, and the person may feel restless. They most commonly occur between the ages of 20 and 40 but can occur at any age, including in children and older adults. They are more common in men than in women¹. Cluster headaches are usually triggered by alcohol⁵.
• Migraine: This is a common type of headache that occurs repeatedly. It causes moderate-to-severe throbbing pain, usually on one side of the head¹. It usually lasts between 4 to 72 hours³ and can cause symptoms like nausea, vomiting, and blurred vision. Some people may experience warning signs, also known as aura, such as flashing lights (most common), tingling sensations in the arms and legs, or trouble speaking, prior to or during the headache^6,7 They mostly occur during puberty and are common among people aged 35 to 45 years. Women are more prone to migraine than men. In children, a migraine attack lasts usually for a short period and can also cause stomach-related symptoms³.  The most common triggers include alcohol consumption, certain odours, weather changes, hunger, and emotional stress⁵.

2. Secondary Headache

This is a type which indicates an underlying health condition, such as high blood pressure (BP), infection, or head injury. It can last from a few minutes to several days, weeks, or even months, depending on the underlying cause⁸. It happens when the condition affects the pain-sensitive tissues or nerves in the head. It is less common, but needs prompt medical evaluation and treatment for the underlying cause rather than the headache itself¹. Examples include:  

• Sinus Headache: Although less common, sinus headaches occur when the sinuses become inflamed or infected^9,10. A sinus headache may cause pain or pressure around the forehead, cheeks, eyes, or nose, and on one or both sides of the face. The pain may worsen when a person bends forward or lies down⁶, and can last for more than 12 weeks if left untreated¹⁰. It is often accompanied by a blocked or runny nose, inflammation of the nasal passages, thick yellow or green nasal mucus, facial tenderness, or cough⁶. The most common triggers include smoking, hay fever/allergic rhinitis, cold, and altitude changes¹⁰. However, in many self-diagnosed cases, migraines are actually mistaken for sinus headaches¹¹. 
• Medication Overuse Headache: This is also known as a rebound headache. It usually occurs due to the frequent or long-term use of pain-relieving medicines. Instead of reducing the pain, overusing these medicines can make headaches occur more often, sometimes for more than 15 days each month. This happens because the frequent use of these medicines can change the way the brain responds to pain. The common culprits are narcotic medicines, triptans, and even over-the-counter medications, such as ibuprofen and acetaminophen¹². 

Other types of secondary headaches include post-traumatic headache (related to head injury or trauma), headaches related to an arterial ischemic event (caused by reduced blood flow to the brain due to a stroke), headaches related to arthritis, hypertension headache (caused by extremely high BP), and reversible cerebral vasoconstriction syndrome (caused by temporary narrowing of the blood vessels in the brain)⁸.

Symptoms of Headache

Headache symptoms can vary based on the type. While some symptoms are specific to certain types of headaches, there are a few common signs and symptoms that many people with headaches may experience. These include: 

• Mild-to-severe pain 
• Pain on one or both sides of the head or that encompasses the entire head 
• Sudden or gradual pain 
• Pain that lasts for minutes to hours or days, affects sleep, or becomes worse with physical activity, movement, coughing, or bending forward 
• Difficulty carrying out daily activities due to the pain 
• Episodes that occur occasionally or repeatedly over time¹

Causes of Headache

The causes of headaches vary depending on the type. Some of the most common headache causes include the following. 

Causes of Primary Headaches

• Stress and emotional tension 
• Muscle tightness 
• Poor posture (eye strain, prolonged screen time, etc.) 
• Dehydration and alcohol use 
• Disruptions to the body’s natural sleep and wake cycle¹
• Hormonal changes³
• Skipping meals⁶
• Changes in the levels of certain brain chemicals (e.g., serotonin and histamine)¹³ 

Causes of Secondary Headaches

• Infection, inflammation, or fluid build-up in the sinuses¹
• Nasal polyps. These are growths inside the sinus or nose lining¹⁴ that may rarely cause a headache if they block the sinus or cause a sinus infection 
• Frequent or long-term use of medications such as triptans, narcotics, and aspirin¹²
• Head injury 
• Extremely high BP that may be life-threatening (hypertensive emergencies) 
• Tumours 
• Stroke¹

Risk Factors for Headaches

In addition to understanding the causes of headaches, knowing the risk factors is very important to reduce the risk or manage the condition. Factors that may increase the risk of a person having headaches include: 

• Sex (headaches are more common in women) 
• Family history of headaches 
• Weather changes 
• Caffeine intake 
• Smoking and alcohol use (particularly red wine) 
• Bright light and strong smell (in the case of migraine) 
• Certain foods (cheese, chocolate, monosodium glutamate, processed meat, etc.) 
• Emotional stress¹
• Seasonal allergies (pollen, dust, moulds, etc.) and cold. However, these may be accompanied by other triggers such as migraine, acute upper respiratory infections, or acute sinus infection. 
• Dry air 
• Weak immune system¹⁴

Note: These are common risk factors for many types of headaches. Having one or more of these risk factors does not guarantee you’ll get headaches. 

How Are Headaches Diagnosed?

The following are the approaches a doctor might take to identify the type of headache: 

• Medical History: The doctor might enquire about the symptoms, including when the headaches began, how frequently they occur, where the pain is felt, how long they persist, family history, any known allergies, and the medications usually taken while having a headache^1,12,14. 
• Physical Examination: The doctor might look for symptoms such as fever, high BP, sinus problems, or neck stiffness that may be causing the headache¹.
• Neurological Examination: The doctor may assess the reflexes, muscle strength, sensation, balance, coordination, vision, and other nerve functions to look for abnormalities^1,6

• Blood Tests: The doctor might suggest tests such as: 
  • Complete Blood Count:  to help detect infections contributing to headaches¹.
  • C-Reactive Protein (CRP) Test- Quantitative: which helps measure the level of inflammation in the body that can cause infections or inflammatory conditions that may contribute to headaches⁶.

• Imaging Tests: The doctor might recommend imaging tests such as a computed tomography (CT) scan or magnetic resonance imaging (MRI) scan in case of suspected serious underlying conditions, such as a brain injury, tumour, bleeding, or stroke¹.
• Lumbar Puncture: The doctor may recommend a lumbar puncture⁶, in which a small sample of spinal fluid is collected to help identify the cause of the headache, such as an infection (meningitis, encephalitis, etc.), cortical (surface of the brain) bleeding, increased pressure inside the skull, or problems with the fluid surrounding the brain and spinal cord (cerebrospinal fluid)^8,15. 

Treatment for Headache

Headache treatment is determined by its type, severity, frequency, and underlying reason. While some headaches can be treated with simple lifestyle adjustments, others may necessitate prescription medications or therapy for the underlying medical issue. The treatment approaches that are commonly recommended include: 

1. Prescription (Standard) Medications

Depending on the type of headache, the doctor may recommend pain-relieving medicines, such as paracetamol or ibuprofen¹⁶, triptans or beta-blocker medicines (for migraine), antidepressants or barbiturates (for tension headaches; barbiturates are not routinely recommended due to a risk of medication overuse headache), verapamil (for cluster headaches)¹. Although some of these medicines are available as over-the-counter medicines, taking them too often or without a doctor’s advice is not advisable¹².

2. Treatment of Any Underlying Conditions

Headaches caused by an underlying medical condition (secondary headaches), such as sinus infections, high BP, or brain tumours, require treatment of the underlying cause. This may include antibiotics, nasal corticosteroid sprays or anti-histamines (for sinus infection)¹⁰, BP medications (for high BP), surgery (for tumours), etc.⁸, depending on the cause.   

3. Physical Therapy

Exercises, stretching, and posture correction to help with tension headaches or headaches caused by muscle strain⁴.

4. Medical Procedures

 Surgeries, chemotherapy, etc., in cases where the headaches do not respond to medicines, for example, a tumour that is causing a headaches⁵.

Note: Headache treatment differs from person to person based on the type, severity, frequency, and underlying cause. Do not self-medicate or take pain relievers on a regular basis without consulting a doctor, since this can worsen headaches. 

Tips for Prevention of Headaches

People often wonder how to reduce headaches naturally. The best approach is to prevent headaches rather than treating them after they occur. Here are some simple ways to help reduce the risk of getting a headache: 

1. Avoiding Triggers

Identifying and avoiding personal headache triggers, such as certain foods, alcohol, smoking, dehydration, bright lights, lack of sleep, improper posture, etc., can help reduce headache episodes. 

2. Relaxation Techniques

 Deep breathing, meditation, yoga, regular exercise and other relaxation methods can help reduce stress-related headaches¹.

3. Schedule Regular Health Check-Ups

Undergoing regular health check-ups, especially in people with conditions such as high BP or allergies, can help identify and manage factors that may contribute to headaches. 

Note: These recommendations may help reduce the frequency or severity of headaches, but they do not guarantee perfect prevention. If headaches are severe, frequent, sudden, or persistent despite these precautions, see a doctor for a correct diagnosis and treatment. 

Also Read: Home Remedies For Headache By Dr. Siddharth Gupta

When to Consult a Doctor?

Consult a doctor if: 

• The headache is sudden and extremely severe 
• Headaches interfere with your daily activities despite treatment 
• A severe headache occurs following a head injury 
• Headache is accompanied by fever, stiff neck, confusion, seizures, weakness, numbness, or difficulty speaking 
• A new headache occurs (especially in cancer survivors or one with a history of HIV/AIDs) 
• Someone is over 50 years old and develops a new headache for the first time¹

Conclusion

Headaches are common and, in most cases, do not indicate a major health problem. They might be caused by common conditions like stress, dehydration, lack of sleep, or illness, but they can also be symptoms of an underlying medical disease. Consult a doctor immediately for an accurate diagnosis and treatment if headaches are severe, frequent, or accompanied by strange symptoms. Understanding the various types, symptoms, and triggers might help in managing headaches more successfully. 

Frequently Asked Questions (FAQs)

References

1. Headache. 2026. Available from: https://www.ninds.nih.gov/health-information/disorders/headache 

2. Robertson CE, Benarroch EE. The anatomy of head pain. Handb Clin Neurol. 2023;198:41-60. doi: 10.1016/B978-0-12-823356-6.00001-9. PMID: 38043970. Available from: https://pubmed.ncbi.nlm.nih.gov/38043970/

3. Migraine and other headache disorders. 2025. Available from: https://www.who.int/news-room/fact-sheets/detail/headache-disorders 

4. Nihir Shah, Asuncion RMD, Hameed S. Muscle Contraction Tension Headache. 2024. Available from: https://www.ncbi.nlm.nih.gov/books/NBK562274/ 

5. The Complete Headache Chart. Available from: https://headaches.org/resources/the-complete-headache-chart/ 

6. Headaches. 2025. Available from: https://www.healthdirect.gov.au/headaches 

7. Joppeková Ľ, Pinto MJ, Da Costa MD, et al. What does a migraine aura look like?—A systematic review. J Headache Pain. 2025;26(1):149. doi:10.1186/s10194-025-02080-6 Available from: https://pubmed.ncbi.nlm.nih.gov/40597581/

8. Wijeratne T, Wijeratne C, Korajkic N, Bird S, Sales C, Riederer F. Secondary headaches – red and green flags and their significance for diagnostics. eNeurologicalSci. 2023 Jun 30;32:100473. doi: 10.1016/j.ensci.2023.100473. PMID: 37456555; PMCID: PMC10339125. Available from: https://pubmed.ncbi.nlm.nih.gov/37456555/

9. Jones NS. Sinus headaches: avoiding over- and mis-diagnosis. Expert Review of Neurotherapeutics. 2009;9(4):439-444. doi:10.1586/ern.09.8 Available from: https://pubmed.ncbi.nlm.nih.gov/19344297/

10. Sinusitis. 2024. Available from: https://medlineplus.gov/ency/article/000647.htm 

11. How to Know if You Have Migraine or Sinus Headache. 2023. Available from: https://americanmigrainefoundation.org/resource-library/sinus-headache/ 

12. Medication Overuse Headache. 2022. Available from: https://headaches.org/resources/medication-overuse-headache/ 

13. Aggarwal M, Puri V, Puri S. Serotonin and CGRP in migraine. Ann Neurosci. 2012 Apr;19(2):88-94. doi: 10.5214/ans.0972.7531.12190210. PMID: 25205974; PMCID: PMC4117050. Available from: https://pubmed.ncbi.nlm.nih.gov/25205974/

14. Sinus Infection Basics. 2024. Available from: https://www.cdc.gov/sinus-infection/about/index.html 

15. Kim KT. Lumbar puncture: considerations, procedure, and complications. encephalitis. 2022;2(4):93-97. doi:10.47936/encephalitis.2022.00045 Available from: https://pubmed.ncbi.nlm.nih.gov/37469996/

16. Medicines for headaches. 2025. Available from: https://www.healthdirect.gov.au/medicines-for-headaches 

17. Hong Y, Kang MK, Kim MS, Mo H, Cox RC, Im HJ. Morning Headaches: An In-depth Review of Causes, Associated Disorders, and Management Strategies. Headache and Pain Research. 2025;26(1):66-79. doi:10.62087/hpr.2024.0023 Available from: https://www.researchgate.net/publication/405443332_Comments_on_Morning_Headaches_An_In-Depth_Review_of_Causes_Associated_Disorders_and_Management_Strategies

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