A headache on the left side of your head can be due to a primary headache disorder, like migraine or cluster headache. It can also occur due to an injury like a concussion, lifestyle factors like diet or insufficient sleep, or a condition such as allergies, high blood pressure, or stroke. Show
Some of these can be self-managed, while others may need the help of a healthcare practitioner—in some cases, urgently. The fact that the pain is only on the left side of your head offers them clues as to what's going on. This article will go
over what causes left-sided headaches and how to manage this condition. Paolo Sousa / Getty Images Clinically referred to as “unilateral headaches,” headaches on one side of the head arise due to a variety of factors. Everything from lifestyle choices to head injury can be at fault. Here’s a breakdown of common causes of left side headaches. Lifestyle ContributorsSome one-sided headaches arise due to lifestyle factors. Understanding these connections can be a way of preventing and minimizing the impact of this issue. Common factors that can bring these issues on include:
Common Health ConditionsA variety of common health conditions can cause headaches. These include:
Monitoring Your Blood PressureHigh blood pressure can lead to stroke, heart disease, and other serious health issues. This is why it’s important to know what your blood pressure is. If it's high (above 140/90), talk to your provider about ways to get your numbers down. Less Common Health Conditions In addition to the common conditions listed above, some less common conditions can also cause headaches. Contact your healthcare provider if you are concerned that you are experiencing any of these conditions:
MedicationsHeadaches can also be an unintended side effect of some medications, so it’s important to understand what you’re taking. Headaches may arise when you take:
Generally, the headaches go away if you stop or reduce intake of these drugs. However, be sure to talk to your healthcare provider first before making any changes. Medication Overuse HeadachePeople who take too many pain medications too frequently—more than three times a week—can experience medication overuse headache (MOH), also known as “rebound headache.” This type is chronic, with symptoms arising daily. Several classes of drugs can cause MOHs, including:
Neurological CausesLeft-sided headaches can also arise due to nerve damage in the spine, neck, and head. This is the case with occipital neuralgia, giant cell arteritis, and trigeminal neuralgia. These conditions can be debilitating and require medical attention.
Types of HeadachesTensionTension headaches are the most common kind. As the name suggests, they are due to both physical and psychological tension and distress. Common causes of tension headaches include:
This type of headache is usually mild to moderate in intensity, and usually affects both sides of the head, though it can affect only one side, too. Alongside pain, you may feel pressure on the face or neck. MigraineMigraine is a primary headache disorder that can cause unilateral head pain, among other symptoms. Lasting anywhere from four to 72 hours, these moderate to severe headaches are sharp and stabbing, and localized in one area. In addition, migraine attacks cause a range of other symptoms:
Migraine VariabilityThere are several kinds of migraines. Some, like vestibular migraine (involving visual auras, sensitivity, and extreme dizziness) arise with or without headache, while others may cause headaches on both sides. Symptoms vary considerably from person to person. ClusterRare and very severe, cluster headaches are characterized by recurring groupings of headache attacks (clusters) lasting one to three hours. The symptoms include:
During active periods, these can arise daily or even multiple times a day; however, there generally are periods of remission afterward, lasting months to years. ChronicIn some cases, headaches arise regularly and are resistant to treatment. Encompassing a couple of different types of headaches, chronic daily headache (CDH) is a term for when symptoms arise 15 or more days a month. There are several types:
These can be very difficult to live with. If you’re struggling with regular headaches, be sure to seek out medical help. TreatmentThe treatment for headaches depends a great deal on the specific cause. Therapies for these conditions tend to be multifaceted, blending medical approaches with lifestyle changes. Approaches include using “rescue” medications after the onset of headache, preventive drugs, lifestyle changes, and other medical treatments. Rescue MedicationsBoth over-the-counter and prescription medications help with headaches. These can come in the form of pills, or, for quicker delivery, as nasal sprays. Effective classes of drugs include:
Preventive MedicationsEffective for conditions like migraine and cluster headache that are occurring more often are preventive medications. These include:
Botox Injections for Chronic HeadacheIn difficult-to-manage and chronic headache cases, a pain specialist may consider injection of OnabotulinumtoxinA to the nerves, or Botox injection. This prevents attacks by deadening nerves associated with pain messaging. The effect isn’t permanent, however, and additional treatment is needed every three months. Medical Procedures for Chronic HeadacheIn cases of chronic headache that’s resistant to treatment, neurologists and pain specialists may consider neurostimulation to take on the pain. These focus on using mild electrical shocks or magnetic waves to stimulate nerves associated with the headaches. This essentially scrambles the pain sensation at its source. These therapies include:
LifestyleAlongside medications and medical approaches are a number of things you can do on your own to help prevent and minimize headache attacks. These include:
When to Seek Medical AttentionWhile most headaches don’t necessarily call for medical attention, it’s important to remember that the pain might be related to something more serious and dangerous. Get emergency medical help if you in the following cases:
Other cases should prompt a call to your healthcare provider. Do so if, alongside your headache, you experience the following:
SummaryHeadaches on the left side of the head arise due to many reasons. They can be symptoms of illnesses, underlying health conditions, allergies, side effects of medications, concussions, or be triggered by lifestyle factors, such as lack of sleep. Stress and tension bring on tension headaches, which are the most common type. You might also experience one-sided headaches due to primary headache disorders, especially migraine and cluster headaches. Treatment for these conditions may involve taking over-the-counter or prescription pain medications, triptans, antidepressants, and others. In addition, lifestyle modifications, such as ensuring good sleep and a healthy diet, can also help. A Word From Verywell While headaches are a fact of life, if you regularly suffer from them, it's worth exploring your care options. The more proactive you are about managing your health and taking control of your condition, the better off you'll be. And while there's no outright cure for some headache disorders, there's a great deal that you—and your healthcare provider—can do. Frequently Asked Questions
Why am I feeling a sharp pain in the back of my head?Tension headaches are the most common cause of pain. These headaches occur in the back and right side of your head. They may include a tightness of the neck or scalp.
When should I be concerned about a sharp pain in my head?Intense, sudden headaches (often called thunderclap headaches) are not always serious, but they can be a sign of a potentially life-threatening condition. A sudden and intense headache can indicate an aneurysm or bleeding in the brain. Additional signs of this are blurred vision, loss of consciousness, and seizures.
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