Tension Headache: Why Painkillers Make It Worse
Tension headache is the most common headache there is, and almost nobody with one has been given the piece of information that matters most about it. Not what causes it, not what stretches to do — but how many days a month it is safe to treat.
That number is the difference between a headache that comes occasionally and a headache that arrives every single morning. And the mechanism that turns one into the other is the treatment itself.
🧠 The name is misleading, which is part of why the condition is handled badly. Tension headache is not simply muscle tension caused by stress. Muscle tenderness around the skull is genuinely part of it — the muscles of the scalp, temples, jaw and neck are measurably more sensitive to pressure in people who get these headaches, and more so on headache days.
But once headaches become frequent, something else takes over. The pain pathways themselves become more responsive, so that ordinary signals from those muscles are registered as pain. At that point the headache is being maintained by the nervous system rather than by whatever started it, which explains why treating the muscles alone stops working and why a headache can persist long after the stressful period that preceded it has ended.
🔎 Telling it apart from migraine
This distinction decides the entire treatment, and getting it wrong is common in both directions — people call every bad headache a migraine, and people dismiss genuine migraine as stress.
| Tension headache | Migraine | |
|---|---|---|
| Where | Both sides, like a band or a tight cap | Usually one side, though it can change sides |
| Quality | Pressing, tightening. Not throbbing | Throbbing or pulsating |
| Severity | Mild to moderate. You can carry on | Moderate to severe. You want to stop |
| Movement | Walking upstairs does not make it worse | Ordinary activity makes it distinctly worse |
| Sickness | Absent | Nausea, sometimes vomiting |
| Light and sound | Possibly one of them, mildly | Both, and strongly enough to seek a dark room |
| Warning signs | None | Visual disturbance or tingling before the pain, in some people |
| Neck and scalp | Tender to press | May be tender, but not the defining feature |
The single most useful question is about movement. If climbing a flight of stairs makes the headache noticeably worse, it is behaving like a migraine. If it makes no difference, it is behaving like a tension headache. That one test separates them more reliably than location does, because tension headache is occasionally one-sided and migraine is occasionally on both.
The two also coexist in a great many people, which is why anyone with frequent headaches is worth assessing properly rather than being handed a single label. Migraine treatment is covered in the article on how migraine drugs work, and the medicines involved are entirely different from the ones discussed here.
🚨 The trap that creates daily headaches
Here is the thing that should be printed on every packet of painkillers and is not.
Taking acute painkillers too often for headache causes headache. Not as a rare side effect — as a predictable consequence. The medicine that relieves the pain on Monday makes Wednesday more likely, and once the pattern establishes itself the headache becomes daily, milder in character, present on waking, and completely resistant to the tablets that are now being taken every day to control it.
🔴 The limits, which almost nobody is told.
Plain paracetamol or a plain anti-inflammatory: fewer than 15 days per month.
Anything combined, anything containing codeine, and migraine-specific tablets: fewer than 10 days per month.
Note that the limit counts days of use, not doses. Two tablets on twelve separate days is worse than twenty tablets across four days, because the effect is driven by how frequently the pain system is interrupted, not by the total quantity swallowed.
The pattern to recognise: a headache present most mornings, milder than the original headaches were, that eases briefly after tablets and returns as they wear off. If painkillers have been taken most days for three months or more, this is the likeliest explanation for the daily headache — not a new disease, and not the original condition getting worse.
Combination products deserve a specific warning because they cause the problem fastest. Anything mixing a painkiller with codeine or with caffeine reaches the threshold at ten days rather than fifteen, and produces a withdrawal effect of its own on top of the headache. Products sold specifically for headache are frequently exactly these combinations.
📅 What stopping actually involves
The treatment for a headache caused by painkillers is to stop the painkillers, and there is no way to make that sound appealing.
It gets worse before it gets better. The first week to ten days are genuinely difficult, often with a marked increase in headache, and sometimes with nausea, poor sleep and irritability. Where caffeine-containing combinations have been used, some of that is caffeine withdrawal, which peaks within the first two days.
Improvement takes two to eight weeks. Not days. This is the reason most attempts fail — people stop for five days, feel worse, and reasonably conclude the tablets were helping after all.
What the headache looks like afterwards is the real information. Once the overuse pattern clears, the underlying headache becomes visible again, usually far less frequent than it had been. Only then is it possible to see what is actually being treated, and to choose a preventive if one is needed.
Anyone stopping should discuss it with a doctor first, particularly where opioid-containing products have been used daily, and preferably start a preventive at the same time rather than afterwards.
💪 What physical therapy actually achieves
Since the original question here concerns physical treatment, it deserves an honest answer rather than an enthusiastic one.
The evidence is real but modest, and it is strongest for the approaches that make the person more active rather than the ones performed on a passive patient.
| Approach | Where it stands |
|---|---|
| Neck and shoulder exercise | The best supported. Strengthening and endurance work for the deep neck muscles, done consistently over weeks. Unglamorous and effective |
| Manual therapy and mobilisation | Reasonable evidence, best combined with exercise rather than given alone. Relief from hands-on treatment by itself tends not to last |
| Trigger point treatment | Tender points in the neck, shoulder and jaw muscles are genuinely more common in these patients and pressing them can reproduce the headache. Treating them helps some people. The evidence is thinner than the enthusiasm around it |
| Heat | Cheap, safe, symptomatically useful, no lasting effect |
| Electrotherapy | Weak evidence. Not a reason to avoid it, not a reason to build treatment around it |
| Posture correction | Heavily oversold. The link between posture and headache is weaker than commonly claimed. What does help is changing position regularly rather than achieving a correct one |
| Traction | Little supporting evidence for this condition |
The practical version: a course of hands-on treatment that teaches an exercise programme is worth doing. A course of hands-on treatment that requires indefinite return visits without any exercise being learned is treating the appointment rather than the headache.
💊 Treating an attack properly
Three rules make acute treatment work better and reduce the risk of the trap described above.
Treat early and adequately. A full dose taken when the headache begins works considerably better than a half dose taken after four hours of waiting to see whether it passes. Repeated under-dosing is one of the routes into taking something every day.
Prefer a single-ingredient product. Plain paracetamol or a plain anti-inflammatory, rather than a combination containing caffeine or codeine. The limit is more generous and the withdrawal effect is smaller.
Count the days. Mark them on a calendar or a phone. Almost nobody who has slipped into daily use realised it was happening, because it happens gradually and nobody was counting.
The anti-inflammatory options carry their own considerations — stomach irritation and bleeding risk, caution in kidney disease, caution with blood pressure and heart conditions — which matter more the more regularly they are taken. Paracetamol is gentler on the stomach and has a hard ceiling on daily dose that must not be exceeded, because the margin between the maximum dose and liver injury is narrower than most people assume.
🛡️ Preventing them instead
Once headaches occur frequently, the answer is not a better painkiller. It is a preventive taken daily whether or not there is a headache that day.
Amitriptyline is the best established option, and there are three things worth knowing about it that are often not explained, with the result that people stop it early.
It is an antidepressant, and it is not being given for depression. Its effect on pain is separate, and it works in people whose mood is entirely normal. The dose used for headache is far below the antidepressant dose — treatment starts very low and increases gradually over weeks.
It takes four to eight weeks to show its effect. Judging it after ten days is judging it too early.
It is sedating, which is why it is taken in the evening — and taking it a few hours before bed rather than at bedtime substantially reduces morning grogginess. Other effects include dry mouth, constipation and some weight gain, and these are dose-related, which is the argument for going up slowly and stopping at the lowest dose that works.
Where it is unsuitable, other antidepressant classes are used second line. And in all cases the preventive works alongside the exercise programme rather than instead of it.
🦷 The contributors people miss
Several ordinary things drive these headaches and are rarely asked about.
Jaw clenching and grinding, much of it during sleep, produces exactly the pattern of morning headache with tender temples that gets attributed to stress in general. Worn teeth, a jaw that aches on waking or clicks, and tenderness in front of the ears point to it, and a dentist can confirm it and fit a guard.
Caffeine works in both directions. Withdrawal produces a reliable headache beginning within a day of the last dose, which is why headaches often arrive on the first morning of a holiday or at a weekend. Meanwhile caffeine within combination painkillers contributes directly to the overuse pattern. Consistency matters more than quantity.
Sleep, in both directions again — too little and, in some people, too much on days off.
Dehydration and missed meals, both straightforward and both commonly the explanation for a headache on a busy day.
Long static periods at a screen, which matter less because of posture than because of immobility. Regular movement helps more than any particular chair or desk arrangement.
Uncorrected vision, worth excluding once with an eye test, though it is a considerably less common cause than is generally believed.
Where headache sits alongside other unexplained physical symptoms, the article on anxiety and physical symptoms covers the amplification mechanism that connects them, and the article on cortisol covers why sustained arousal produces muscle pain that is entirely real.
🚩 What is not a tension headache
Tension headache is diagnosed by pattern, and the pattern has to fit. These features do not fit, and each needs assessment rather than a painkiller.
- A headache reaching maximum intensity within a minute — emergency, regardless of what follows
- Fever with neck stiffness and dislike of light — emergency
- Headache with weakness, numbness, confusion, slurred speech or visual loss — emergency
- A first significant headache after the age of fifty — needs assessment
- Headache that is worst lying flat and on waking, improving when upright — suggests raised pressure inside the skull, discussed in the article on brain fluid disorders
- Headache that wakes you from sleep, or that is consistently worse on coughing or straining
- A clear change in a long-standing headache pattern
- Headache following a head injury
- Headache with scalp tenderness and jaw pain on chewing in someone over fifty — urgent, this can threaten sight
- New headache during pregnancy, in cancer, or with a weakened immune system
🩺 When to seek help
- Any of the features listed immediately above
- Headache on more than fifteen days a month, whatever its character
- Painkillers being taken on most days — and say so plainly, since this is treatable and not a failing
- Headache present on waking most mornings
- Painkillers no longer working as they used to
- Before stopping daily painkillers, particularly anything containing codeine
- Headache interfering with work or sleep — a preventive is likely warranted
- Morning headache with jaw ache or worn teeth — a dental assessment
Acute options are stocked in the pain medicine category, including Paracip (paracetamol), Motrin (ibuprofen) and Naprosyn (naproxen) — all subject to the day limits described above. For prevention rather than relief, Elavil (amitriptyline) is the best established option, taken daily, in the evening, and given several weeks before it is judged.
❓ Frequently asked questions
How many days a month can I take painkillers for headache?
Fewer than fifteen days a month for plain paracetamol or a plain anti-inflammatory, and fewer than ten for anything combined, anything with codeine, or migraine-specific tablets. The limit counts days rather than doses — two tablets on twelve separate days is worse than twenty tablets across four days, because the effect depends on how often the pain system is interrupted.
Can painkillers really cause headaches?
Yes, and it is one of the commonest causes of daily headache. Taken too frequently they produce a headache that is present most mornings, milder than the original attacks, that eases briefly after a dose and returns as it wears off. It is not the original condition worsening and it is not a new disease. If painkillers have been taken on most days for three months or more, this is the likeliest explanation.
How do I know whether it is tension headache or migraine?
The most useful single test is movement. If climbing a flight of stairs makes the headache clearly worse, it is behaving like migraine; if it makes no difference, like a tension headache. Beyond that, tension headache is pressing rather than throbbing, on both sides, mild to moderate, and without nausea. Migraine is throbbing, usually one-sided, more severe, and comes with sickness and a strong dislike of light and sound.
What happens when I stop the painkillers?
It gets worse first. The initial week to ten days are genuinely difficult, often with a marked increase in headache and sometimes nausea and poor sleep. Real improvement takes two to eight weeks, not days — which is why most attempts fail, since people stop for five days, feel worse and conclude the tablets were helping. Discuss it with a doctor first, and ideally start a preventive at the same time.
Why prescribe an antidepressant for a headache?
Because its effect on pain is separate from its effect on mood, and it works in people whose mood is entirely normal. The dose used for headache is far below the antidepressant dose, starting very low and increasing gradually. It is a preventive taken every day rather than something taken when a headache arrives, and it needs four to eight weeks before it can be judged.
Does physiotherapy work for tension headache?
Modestly, and the strongest evidence is for the parts that make you active rather than the parts done to you. Neck and shoulder strengthening done consistently over weeks is the best supported. Manual therapy helps most when combined with exercise; alone, the relief tends not to last. A course that teaches you an exercise programme is worth doing. A course that requires indefinite return visits without teaching you anything is treating the appointment.
Is my posture causing this?
Less than you have been told. The link between posture and headache is weaker than the popular narrative suggests, and chasing a perfect sitting position rarely helps much. What does help is changing position regularly — the problem with long screen sessions is immobility rather than the particular angle of the neck. Movement beats furniture.
Why do I get headaches at weekends?
Most often caffeine withdrawal, which produces a reliable headache beginning within about a day of the last dose — so a later or smaller first coffee on a day off is enough to trigger it. Sleeping longer than usual contributes in some people. Consistency across the week matters more than the total amount of caffeine.
I wake with a headache and my jaw aches. Are they connected?
Very likely. Clenching and grinding during sleep produces exactly that pattern — morning headache with tender temples, usually attributed to stress in general. Worn teeth, a jaw that aches on waking or clicks, and tenderness in front of the ears point to it. A dentist can confirm it and fit a guard, which frequently resolves the headache without any medication at all.
Which headaches are not tension headaches?
Anything reaching full intensity within a minute, anything with fever and a stiff neck, and anything with weakness, numbness, confusion or visual loss — all emergencies. Also a first significant headache after fifty, one that is worst lying flat and improves on standing, one that wakes you from sleep, one following a head injury, and any clear change in a long-standing pattern. These need assessment rather than a painkiller.
📑 Sources and editorial
- International classification criteria for tension-type headache and for migraine without aura
- Literature on pericranial tenderness and central sensitisation in chronic tension-type headache
- Diagnostic criteria and day thresholds for medication overuse headache by drug class
- Evidence on withdrawal course and time to improvement following analgesic discontinuation
- Trial evidence for amitriptyline in chronic tension-type headache, including dose and latency to effect
- Systematic reviews of manual therapy, exercise and physical modalities in tension-type headache
- Evidence on posture and headache, and on the effect of static working positions
- Literature on caffeine withdrawal headache onset and duration
- Evidence on sleep bruxism and temporomandibular disorder in relation to morning headache
- Guidance on headache red flags requiring urgent assessment
- Related reading: how migraine drugs work, anxiety and physical symptoms, raised pressure inside the skull
- Related products: pain medicine category
- RXshop Editorial Team — reviewed by James Carter, MD, Neurology
Medical Disclaimer: The information in this article is for educational and informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek guidance from a qualified healthcare provider with any questions you may have regarding a medical condition, and before starting, stopping or changing any medication.