Why PMS Happens - Diet, Exercise, and Medication Options That Ease the Symptoms

How PMS Works - Sharp Hormonal Swings Unsettle the Brain

PMS (premenstrual syndrome) is the umbrella term for the physical and emotional symptoms that appear during the luteal phase, the roughly 14 days between ovulation and the start of menstruation. According to the explanation published by the Japan Society of Obstetrics and Gynecology (as of January 2025), 70 to 80% of women in Japan notice some kind of premenstrual complaint, and 5% have premenstrual syndrome severe enough to interfere with daily life. Symptoms most often last for about 3 to 10 days before menstruation and ease on their own once bleeding begins.

Why PMS happens has not been fully explained. The leading candidate is progesterone, which rises sharply after ovulation, together with its metabolite allopregnanolone. Allopregnanolone acts on GABA receptors in the brain and normally has a calming effect. When progesterone drops abruptly in the second half of the luteal phase, however, the sensitivity of those GABA receptors shifts, and anxiety and irritability are amplified. The mechanism resembles alcohol withdrawal.

Progesterone swings also affect the serotonin system. During the luteal phase the activity of that system changes, and the serotonin available in the brain is thought to become easier to deplete. Because serotonin is involved in stabilizing mood, controlling appetite, and regulating sleep, a decline brings on food cravings, insomnia, and low mood.

PMS Versus PMDD - Telling Them Apart Is the First Step in Treatment

When the emotional symptoms of PMS are extreme, PMDD (premenstrual dysphoric disorder) is a possibility. PMDD is listed as a distinct condition in the DSM-5 (the diagnostic manual for mental disorders) and is reported in a few percent of menstruating women. What separates it from PMS is severity. PMDD brings intense anger, hopelessness, and self-criticism, along with a marked deterioration in relationships, and it seriously disrupts work or study. Outside Japan, raising brain serotonin with an SSRI (selective serotonin reuptake inhibitor) is becoming the mainstream approach.

There are two points that help distinguish the two. The first is whether symptoms improve dramatically once menstruation starts. If they continue after bleeding begins, another condition such as depression or an anxiety disorder should be suspected. The second is record keeping. Track your symptoms daily for at least two cycles; if you can confirm a pattern that worsens only during the luteal phase, that becomes the basis for a diagnosis of PMS or PMDD.

Easing Symptoms Through Diet - Nutrients With Scientific Support

Magnesium - Muscle Relaxation and Nerve Stability

Magnesium is a mineral involved in more than 300 enzyme reactions, and it works to relax muscles, steady the nerves, and balance fluid levels. Women with PMS tend to have lower blood magnesium, and there is research showing that 200 to 400mg a day reduces bloating, headaches, and mood swings. Thirty grams of almonds supplies about 80mg and 100g of spinach about 70mg of magnesium.

Vitamin B6 - A Coenzyme for Serotonin Synthesis

Vitamin B6 is an essential coenzyme in serotonin synthesis. Several studies report that 50 to 100mg a day improves the emotional symptoms of PMS. Long-term intake above 200mg carries a risk of peripheral nerve damage, so stay within the stated dose if you take a supplement. Bananas, chicken breast, and tuna are rich food sources.

Calcium and Vitamin D

In a large randomized controlled trial reported in the United States in 1998, the group that took 1,200mg of calcium a day for three cycles saw total symptom scores fall 48% from baseline, compared with a 30% drop in the placebo group. Vitamin D not only helps calcium absorption but also takes part in serotonin synthesis. As a rough guide, 200ml of milk provides about 220mg of calcium and 100g of yogurt about 120mg.

Exercise for PMS Relief - Start With 30 Minutes, Three Times a Week

Aerobic exercise is consistently recognized as helpful for easing PMS symptoms, and it works through several routes: pain relief and mood improvement from endorphin release, less bloating thanks to better circulation, more serotonin release, and better regulation of the stress hormone cortisol.

What works is moderate-intensity aerobic exercise for 30 minutes or more, three to five times a week. Choose something you enjoy, whether brisk walking, jogging, swimming, or dance. If your body feels heavy during the luteal phase, switching to yoga or stretching is fine. The important shift is not "no exercise because it is the luteal phase" but "the luteal phase is exactly when to keep moving gently."

Medical Treatment - Low-Dose Pills and Kampo Medicine

Low-Dose Pills (OC/LEP) - Stopping Ovulation to Flatten the Waves

Low-dose pills suppress ovulation and narrow the range of hormonal fluctuation, which relieves PMS symptoms at the root. Ultra-low-dose pills containing drospirenone (such as Yaz combination tablets) also help with bloating. Continuous-dosing regimens, which shorten or remove the pill-free interval, control PMS symptoms better than the conventional 21 days on plus 7 days off.

Thrombosis is a side effect of the pill, but the frequency itself is low: across all users of oral contraceptives it is reported at a few cases per 10,000 women a year. The risk rises for women over 35 who smoke, so discussing it with a doctor is essential.

Kampo Medicine - Matched to Your Constitution

Kampo formulas often used for PMS include kamishoyosan (irritability, anxiety, stiff shoulders), tokishakuyakusan (feeling cold, bloating, fatigue), keishibukuryogan (hot flushes, stiff shoulders), and tokakujokito (constipation, hot flushes, lower abdominal pain). With kampo, the fit with your constitution matters, so the same PMS can call for different prescriptions depending on the person. Effects often take one to three months to appear.

Self-Care You Can Manage Day to Day

Keep a Symptom Diary

Rate your symptoms daily on a scale of 1 to 10. An app or a paper planner both work. Once you have two or three cycles of data, your own pattern comes into view. If you can see that irritability starts on day 10 after ovulation, or that bloating peaks three days before menstruation, you can act in advance.

Limit Caffeine and Alcohol

Caffeine amplifies anxiety and irritability, and alcohol disturbs serotonin metabolism. Ideally, hold coffee to one cup a day or less during the luteal phase and avoid alcohol. Chamomile or rooibos tea in their place brings a relaxing effect.

When to See a Doctor

If self-care brings no improvement, or if symptoms are interfering with daily life, see a gynecologist. When PMDD is suspected in particular (intense anger, hopelessness, thoughts of self-harm), get specialist care promptly. Bringing records covering two or more cycles to the appointment makes diagnosis go smoothly. PMS is not something to be endured; it is a condition that appropriate treatment can improve a great deal.