Medication overuse headache

Medication overuse headache is a challenging condition where the very medicines taken to relieve headaches actually cause more frequent and persistent head pain, creating a difficult cycle that affects around 1-2% of people worldwide.

Table of contents

• What is medication overuse headache?
• Other names for this condition
• Who develops this condition?
• Symptoms and warning signs
• What causes medication overuse headache?
• Medications that can cause the problem
• How doctors diagnose this condition
• Treatment and breaking the cycle
• What to expect during withdrawal
• Prevention strategies

What is medication overuse headache?

rebound headache, analgesic rebound headache, drug-induced headache, medication-misuse headache

Medication overuse headache is a type of secondary headache (a headache caused by another condition) that develops when people take headache medications too frequently. When you use pain-relieving medicines too often to treat headaches, these same medications can paradoxically cause more headaches to occur^[1].

The condition creates a frustrating pattern: you take medication to relieve a headache, which provides temporary relief, but when the medication wears off, the pain “rebounds” and often feels even worse. This leads people to take more medication, creating a vicious cycle where the treatment for headache becomes the actual cause of more headaches^[2].

According to the International Classification of Headache Disorders, medication overuse headache is defined as headache occurring on 15 or more days per month for at least three months in a patient with a pre-existing headache disorder, as a consequence of regular overuse of acute headache medication^[7].

Other names for this condition

Healthcare professionals may refer to this condition using several different terms. The most common alternative name is rebound headache, which describes how the pain bounces back after medication wears off^[4]. Other terms you might encounter include analgesic rebound headache, drug-induced headache, or medication-misuse headache^[2].

Who develops this condition?

Medication overuse headache affects approximately 1% to 2% of the general population worldwide, though some estimates range from as low as 0.5% to as high as 2.6%. The condition is more common in women than in men^[4][7].

This condition almost always develops in people who already have a primary headache disorder, such as migraine or tension-type headache. In most cases, migraine is the underlying headache disorder^[12]. Importantly, medication overuse headache is very rare in people who have never had recurrent headaches. People who take pain medications regularly for other conditions like arthritis or irritable bowel syndrome rarely develop this type of headache unless they have a history of headache problems^[6].

Among people with chronic headache (headaches occurring more than 15 days per month), medication overuse headache can affect up to 50% of patients, and it reaches similar rates among those attending specialized headache clinics^[7].

Symptoms and warning signs

The symptoms of medication overuse headache can vary depending on the type of underlying headache you started with and the medications you are using. However, there are several characteristic patterns that help identify this condition^[1].

The headaches typically happen every day or nearly every day. Many people wake up in the morning already experiencing head pain, or the headache develops soon after waking up^[1][4]. A key feature is that the pain temporarily improves when you take medication, but then returns as the medicine wears off—often feeling more intense than before^[4].

The headache characteristics often change as medication overuse headache develops. Instead of having distinct headache attacks with pain-free periods in between, people develop a constant, dull headache that is present on most days or even part of every day. Eventually, you may experience headaches on most days with more severe migraine attacks occurring on top of that background pain^[3].

Other symptoms that commonly accompany medication overuse headache include^[1][4]:

• Nausea
• Restlessness and difficulty staying calm
• Trouble concentrating on tasks
• Memory problems
• Irritability
• Fatigue or feeling constantly tired
• Depression, anxiety, or panic feelings

An important warning sign is when medications of any kind become less effective at controlling your headaches. If you find yourself needing to take pain medication more frequently but getting less relief, this may indicate medication overuse headache is developing^[4].

What causes medication overuse headache?

Medication overuse headache develops when pain-relieving or antimigraine medications are taken too frequently. While it may seem like taking medicine more often would help control worsening headaches, the opposite actually happens: the frequent use of these medications causes your headache condition to become chronic^[2].

A lifelong history of headaches is a major risk factor for developing medication overuse headache. People who have a family history of this condition may also have a genetic susceptibility that makes them more likely to develop it^[6].

The underlying mechanism is thought to involve a neurological readjustment process. When you take pain medication regularly, it raises your pain threshold. However, when pain stimuli are lacking for extended periods, your brain recalibrates and begins to experience normal stimuli as painful^[6]. An overly sensitive nervous system is believed to play a role, where nerve cells in the brain that trigger pain become too easily stimulated^[8].

The time it takes to develop medication overuse headache varies by medication type. For example, if someone is taking triptans, it may take about 1.7 years of overuse for medication overuse headache to develop^[6].

Medications that can cause the problem

Any immediate relief medication has the potential to cause medication overuse headache, including both over-the-counter and prescription medications. However, different medications require different frequencies of use before they lead to this problem^[12].

The following medications can cause medication overuse headache when taken on 10 or more days per month for more than three months^[3][4]:

• Opioids and opioid-containing combination medications (such as codeine-based medicines)
• Barbiturate-containing medications (such as butalbital combinations)
• Triptans (medications specifically designed to treat migraines, such as sumatriptan)
• Ergotamine and ergotamine-containing combination medications
• Combination painkillers (medications that contain multiple active ingredients)

The following medications can cause medication overuse headache when taken on 15 or more days per month for more than three months^[3][4]:

• Paracetamol (also known as acetaminophen)
• Nonsteroidal anti-inflammatory drugs or NSAIDs (such as aspirin, ibuprofen, or naproxen)
• Acetaminophen-aspirin-caffeine combination medications (such as some brands of headache relief tablets)

Common over-the-counter medicines that can cause medication overuse headache include products containing combinations of painkillers with caffeine^[6]. Dietary and medicinal caffeine consumption appears to be a modest risk factor for developing chronic daily headache^[6].

Research has shown that butalbital-containing medications and opioids are particularly likely to increase the risk of migraine progressing from episodic (occurring 0 to 14 days per month) to chronic (occurring 15 or more days per month)^[16].

How doctors diagnose this condition

Doctors can usually diagnose medication overuse headache based on your history of headaches and your pattern of medication use. Most people do not need special testing for this diagnosis^[9][8].

To receive a diagnosis of medication overuse headache, you must meet all of the following criteria^[8]:

• You have headaches occurring on 15 or more days per month
• You are regularly taking headache medication too frequently—either acetaminophen, aspirin, or NSAIDs on 15 or more days per month, OR ergotamine, triptans, opioids, or combination headache medications on 10 or more days per month
• You have been overusing these medications for more than three months
• No other headache disorder better explains your symptoms

Your doctor will ask detailed questions about when your headaches occur, how often you take medication, and what types of medications you use. Being honest and keeping accurate records of your medication use is essential for proper diagnosis^[9].

Routine imaging tests such as CT scans or MRI scans are not necessary for diagnosing medication overuse headache. However, these tests may rarely be performed to rule out other conditions^[8].

Treatment and breaking the cycle

The main treatment for medication overuse headache is to stop or reduce the overused medication. Learning about the condition and understanding other ways to relieve pain are vital parts of treatment. Patient education is crucial, as understanding the condition helps people successfully break the cycle^[9][7].

Your healthcare professional will help you decide whether to stop the medication abruptly or to lower the dose gradually. The best approach depends on which medications you are using and your general health^[3]. Some people can stop the drugs immediately, while others will need to reduce them slowly over 2 to 4 weeks. A few people may need to be hospitalized to withdraw under medical supervision, especially if other medical conditions need careful management^[3][9].

High doses of opioids, barbiturates, or benzodiazepines should never be stopped abruptly, as this can lead to serious withdrawal symptoms. These medications must be reduced gradually under medical supervision^[8][16].

While you are stopping the overused medication, your doctor may prescribe different treatments to help manage your headache pain and withdrawal symptoms. This is called bridge therapy or transitional therapy. These treatments may include nonsteroidal anti-inflammatory drugs, corticosteroids, nerve blocks, and anti-nausea medicines^[9].

Many doctors will also prescribe a preventive medication to treat your original underlying headache disorder. These preventive medications help reduce the number of headache attacks you experience, making it less necessary to rely on pain-relieving medications. Common preventive treatments include medications such as topiramate or newer injectable medications designed specifically for migraine prevention^[8][3].

What to expect during withdrawal

When you stop taking the overused medication, it is important to understand that headaches typically get worse before they get better. This temporary worsening is normal and expected^[9].

The most common withdrawal symptom is worsening of headache. Other withdrawal symptoms may include^[3][9][16]:

• Nervousness and anxiety
• Restlessness
• Nausea and vomiting
• Poor sleep or insomnia
• Stomach upset or diarrhea
• Constipation
• Sweating and shaking (particularly with opioid or barbiturate withdrawal)
• Body aches
• Irritability

Withdrawal symptoms from ergotamine, triptans, and codeine or morphine-based medicines can be the most difficult to manage. Withdrawal from paracetamol and NSAIDs such as aspirin, ibuprofen, or naproxen is usually less severe. Symptoms are also likely to be less severe if the withdrawal process is gradual rather than abrupt^[3].

Most withdrawal symptoms last between 2 to 10 days, although they may continue for several weeks in some cases^[9]. You should discuss a detailed withdrawal plan with your doctor before stopping any painkillers^[3].

Helpful strategies during the withdrawal stage include^[3]:

• Getting regular rest and adequate sleep
• Taking anti-nausea medicines as prescribed
• Keeping well hydrated by drinking plenty of water
• Avoiding caffeine
• Reducing activities and responsibilities where possible
• Using soothing hot or cold packs on your head or neck

Some people may benefit from non-medication approaches such as biofeedback therapy during the withdrawal period^[9].

Prevention strategies

Medication overuse headache is a preventable condition. The most important prevention strategy is limiting how often you take headache medications^[3].

To reduce your risk of developing medication overuse headache, make sure you do not regularly take painkillers on more than two days per week. Painkillers are generally safe to use on a limited number of days each month. It is also safe to use painkillers on extra days during the occasional month or two. However, high-level use of painkillers on a regular basis significantly increases the risk of medication overuse headache^[3].

If you have very frequent headache attacks, preventive treatment is usually recommended. Preventive medications can reduce the number of attacks you experience, which means you will need fewer pain-relieving medications. An effective preventive treatment typically gives better overall control of headaches than relying solely on pain medications. Preventive measures should be considered for patients with four or more headache days per month^[3][5].

Early intervention is crucial. If you notice that you are taking headache medication more frequently, or that your medications are becoming less effective, speak with your healthcare provider before medication overuse headache fully develops^[7].

Keep track of how many days per month you take headache medication. A headache diary can help you and your doctor monitor your medication use and identify patterns before they become problematic^[5].