Medication Overuse Headache: How Painkillers Cause More Pain

Most people who develop medication overuse headache do not realise they have it. They have a headache, they take a tablet, the headache goes, and they go on with their day. Then the headache comes back a little sooner than last time. The tablet works again. Over weeks and months, the gap between headaches shrinks until the headache is simply there most mornings, and the tablet is the first thing they reach for before breakfast.

This is not a coincidence. The brain adapts to frequent pain-signal suppression by becoming more sensitive to pain in the baseline state. The technical term is central sensitisation. When analgesics or triptans are used too often, the central nervous system recalibrates downward, lowering the threshold at which it fires a pain signal. The drug that was solving the problem is now maintaining it.





The medicines most commonly implicated are the ones most commonly available over the counter in India: paracetamol, ibuprofen, aspirin, and combination tablets that bundle caffeine or codeine with an analgesic. Triptans, used for migraine, carry the same risk. According to the International Headache Society, using any of these on ten or more days per month for three or more months is enough to produce medication overuse headache in a person who was already headache-prone.


Combination analgesics containing caffeine or codeine carry a higher risk and can produce the pattern in fewer doses. The caffeine component is particularly relevant in India, where a cup of tea or coffee is already part of the morning ritual. A caffeine-containing painkiller taken daily adds a second caffeine dependency on top of the dietary one, and withdrawal from either source can itself trigger a headache.

Simple analgesics like plain paracetamol or ibuprofen used on fifteen or more days per month cross the threshold. Triptans cross it at ten days. These numbers are not strict cutoffs so much as population averages, individual susceptibility varies, and people with a prior diagnosis of migraine appear to be more vulnerable than those with tension-type headache.

Painkillers are available without prescription at almost every pharmacy in India. There is no gatekeeping on quantity, no pharmacist conversation about frequency of use, and no record that connects one purchase to the next. A person buying a strip of paracetamol every few days has no external check on how often they are doing it.

Cultural factors compound this. Headache is rarely treated as a medical complaint worth a doctor's appointment. It is managed at home, quickly, with whatever is in the medicine cabinet. Admitting to a daily headache often invites suggestions about stress, screen time, or not drinking enough water rather than a referral. The result is that many people with medication overuse headache have been living with it for years before anyone names it.

The ICMR has flagged headache disorders as significantly underdiagnosed in India. Neurologists at major urban centres report that a substantial proportion of patients referred for chronic daily headache turn out to have medication overuse headache as the primary driver, not a new underlying condition, but the consequence of treating the original one too often.



The only way to break the cycle is to stop the overused medication. This is called medication withdrawal, and it produces a predictable worsening of headache for a period that typically runs one to two weeks, sometimes longer with combination analgesics or triptans. The withdrawal headache is not a sign that the original condition has returned. It is the brain resetting its pain threshold.

This process is difficult to manage alone, and it carries real risk for people who have been using high-dose or combination tablets for a long time. A neurologist or headache specialist can supervise the withdrawal, sometimes with a short bridging course of a different medication class to blunt the worst of it. Attempting to stop abruptly without any support is not the safest route for everyone, and the decision about how to do it belongs with a doctor who knows the full picture.

After withdrawal, many people find that their headache frequency drops substantially without any other intervention. The underlying headache disorder, migraine or tension-type, may still need management, but it becomes manageable again rather than constant.

The practical rule is straightforward: treat acute headache no more than two days a week, on average. If a headache is coming often enough that two days a week feels insufficient, that frequency itself is the signal to see a doctor rather than to increase the dose or switch to a stronger tablet.

Keeping a simple headache diary, date, duration, tablet taken, yes or no, takes under a minute and makes the pattern visible. Most people who develop medication overuse headache are genuinely surprised when they count the days. The number is higher than they thought.

Preventive medications exist for both migraine and tension-type headache. They are taken daily regardless of whether a headache is present, and their purpose is to reduce how often the acute treatment is needed in the first place. A neurologist can assess whether a preventive approach is appropriate. This conversation is worth having before the acute tablet becomes a daily habit rather than after.

The headache that starts after a painkiller is not a different headache. It is the same brain, recalibrated by the treatment it was given. Recognising that is the first step toward a day without either.