Period Pain Explained: Prostaglandins, Painkiller Timing, and When to Escalate

Period pain occupies a strange position in India. Studies find that around seven in ten young women experience it, and it costs students and working women days every single month - and yet it is still commonly treated as something to be endured quietly rather than something with a mechanism, a name and a treatment.

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It has all three. This article is entirely about menstrual cramps: what is physically happening in the uterus, why the pain is where it is, why painkiller timing changes everything, when the pain is telling you about a different condition, and what the research on cannabis for this actually shows.

This article is educational and is not medical advice. Vijaya (cannabis leaf extract) is a prescription-regulated ingredient in India and should only be used under the guidance of a registered medical practitioner. Period pain that is worsening over time, occurs outside your period, or comes with very heavy bleeding needs proper gynaecological assessment - please do not manage that with this article.

Key Takeaways

• Cramps are caused by prostaglandins making the uterine muscle contract hard enough to squeeze off its own blood supply. It is the same kind of pain as a cramp anywhere else in the body.
• An Indian study of 1,000 women aged 11 to 28 found dysmenorrhoea in 70.2%, with absence from study or work rising with severity.
• Anti-inflammatory painkillers work by blocking prostaglandin production - which means taking them before the pain peaks works far better than after.
• Pain that started mild and has worsened over years, or that occurs away from your period, points towards a secondary cause such as endometriosis and deserves investigation.
• Cannabis evidence here is almost entirely survey and observational data, rated low quality, and the one controlled-ish study used a suppository, not an oil or a gummy.

Quick Answer

Primary period pain is caused by prostaglandins triggering strong uterine contractions that temporarily cut off the muscle's own blood supply. Anti-inflammatory painkillers target that mechanism directly and are most effective when started before or at the very beginning of pain. Cannabis has been studied for menstrual and pelvic pain only in observational and survey work of low quality, so it is not a substitute for either proper pain relief or a diagnosis.

What is actually happening inside

Every month the lining of the uterus thickens in preparation for a pregnancy. When that does not happen, the lining has to be shed. To shed it, the uterus - which is a muscle - has to contract.

To make it contract, the lining releases chemicals called prostaglandins. These are not hormones travelling around the body; they act locally, right where they are made, and their job here is to make the muscle squeeze.

Now the part that explains the pain. When the uterine muscle contracts hard enough, it compresses the blood vessels running through it and briefly cuts off its own blood supply. A muscle deprived of blood is a muscle deprived of oxygen, and a muscle deprived of oxygen hurts. That is what a cramp is - in your calf at night, and here.

The amount of prostaglandin matters directly. Women with more painful periods have been found to produce more of them, particularly the type called PGF2α, which drives intense contractions, reduces uterine blood flow, and makes the local nerves more sensitive on top of everything else (Journal of Clinical and Diagnostic Research, 2014). More prostaglandin, harder contraction, worse pain. That is the whole chain.

Why the pain shows up where it does

Several things people assume are unrelated are the same process.

• Lower back and thigh pain. The nerves carrying signals from the uterus enter the spinal cord at the same levels as nerves from the lower back and upper legs. The brain cannot always tell them apart, so it reports pain across the whole region. This is referred pain, and it is why your back hurts when nothing is wrong with your back.
• Nausea, loose motions, headache. Prostaglandins do not stay perfectly local. Reaching the intestines, they increase contraction there too. The digestive upset many women get on the first day is the same chemical acting on a different muscle.
• Timing. Pain typically starts just before or with the bleeding and is worst over the first 24 to 48 hours, because that is when prostaglandin release peaks.
• Why it often improves after the early twenties, or after childbirth. Not imagination, and not "growing out of it" in any vague sense - the physical changes in the uterus and cervix genuinely alter the picture for many women.

How common this is in India

A cross-sectional study of 1,000 healthy Indian women aged 11 to 28 found dysmenorrhoea in 70.2%, and measured the cost in days lost: women with mild pain missed around a day and a half a month, rising with moderate and severe pain (Journal of Clinical and Diagnostic Research, 2014). A later systematic review and meta-analysis of Indian students found broadly similar prevalence (Journal of South Asian Federation of Obstetrics and Gynaecology).

Read those absence figures again. Two days a month, every month, through school and college and early career, is a substantial and largely invisible cost.

The painkiller timing most people get wrong

This is the most immediately useful thing in this article.

Non-steroidal anti-inflammatory drugs - the ibuprofen and mefenamic acid family - do not work by numbing pain. They work by blocking the enzyme that manufactures prostaglandins. They stop production.

The consequence is that they cannot remove prostaglandins that have already been released. Taken once the pain is severe, they are fighting chemicals that are already circulating and already causing contractions. Taken at the very first sign - or, where the cycle is predictable, just before the pain usually begins - they prevent much of the prostaglandin load from ever being produced.

Same tablet, same dose, very different result, purely because of timing. Many women conclude these drugs "do not work for me" having only ever taken them at the peak.

Two caveats worth stating: these medicines can irritate the stomach and are not suitable for everyone, particularly with a history of ulcers, kidney problems, or asthma triggered by painkillers - so this is a conversation with a doctor or pharmacist, not a licence. And paracetamol, though widely used here, works on a different mechanism and does not block prostaglandin production in the same way.

Heat genuinely helps too, and not as a placebo: local heat relaxes the muscle and improves blood flow through it, which addresses the actual cause of the cramp.

When it is not ordinary period pain

Everything above describes primary dysmenorrhoea - pain from the normal process, with no underlying disease. Secondary dysmenorrhoea is pain caused by a condition such as endometriosis, adenomyosis, or fibroids, and it is treated completely differently.

Signals that point that way, and that are worth taking to a gynaecologist rather than absorbing:

• Pain that has become steadily worse over years, rather than staying similar or easing
• Pain on days when you are not bleeding, including mid-cycle
• Pain during or after sex
• Very heavy bleeding, or periods lasting longer than a week
• Pain that does not respond to anti-inflammatory painkillers taken properly and early
• Difficulty conceiving alongside painful periods
• Period pain that started in your twenties or thirties, having previously been mild

Endometriosis in particular is diagnosed late almost everywhere in the world, and the usual reason is that severe period pain gets normalised - by the people around the patient and eventually by the patient herself. Pain that stops you functioning is not something to prove you can tolerate.

What the research says about cannabis for menstrual pain

Honestly: this is one of the thinner evidence bases we have written about, and considerably thinner than the confident claims circulating online.

Most of what exists is survey and observational work in endometriosis rather than ordinary period pain. A scoping systematic review found nine completed studies covering 1,787 participants, all of them cross-sectional, and concluded that the evidence for cannabis-based management of endometriosis-associated pain is low quality, with a shortage of prospective data and no randomised controlled trials (ANZJOG, 2026). Pain was the most common reason people reported using it.

The nearest thing to a controlled result is a survey-based, quasi-experimental study of a high-cannabidiol suppository, in which the CBD group reported reduced frequency and severity of menstrual symptoms, less impact on daily functioning, and reduced use of painkillers compared with treatment as usual (npj Women's Health, 2024).

Note what that study used. A vaginal suppository delivers cannabidiol locally, close to the tissue generating the pain. That is a meaningfully different proposition from swallowing an oil or a gummy, and the result does not transfer across formats. Anyone citing that study to sell you an oral product is misreading it.

The professional guidance reflects the same uncertainty: cannabis for pain associated with gynaecological conditions is discussed as an area of interest with limited evidence, not as an established treatment (ACOG clinical consensus, 2024).

What we would actually suggest

• Fix the timing of your painkillers first. It costs nothing, and for a lot of women it is the difference between "these do not work" and a manageable day.
• Use heat properly - it addresses the mechanism, not just the mood.
• Track your cycles and your pain for two or three months. A record is what turns a vague complaint into a diagnosable pattern, and it is what a gynaecologist will ask for.
• Escalate if any of the red flags above apply. Delayed diagnosis is the norm with endometriosis, and the delay is usually caused by nobody being told.
• If you want to discuss Vijaya, do it with a doctor and with accurate expectations - the evidence for menstrual pain specifically is weak, and in India it is a prescription decision regardless.

The most useful sentence in this article is probably the one about painkiller timing, and it costs nothing to act on. The second most useful is that pain severe enough to keep you home from work or college every month is not a personal threshold problem. It is a medical question that has been left unasked.

Fix the painkiller timing first, and escalate if the red flags apply. If Vijaya is something you want to raise with a doctor, every Kushiva order goes through a prescription and medical-review step before dispatch — see the lab-tested range.