A late period is usually caused by a delay in ovulation, not a delay in menstruation itself. Once ovulation happens, your period follows roughly 10 to 16 days later. So most strategies for “making your period come” are really about nudging your body toward that hormonal shift, or addressing whatever is holding it back. Some approaches have real physiological backing, others are mostly folklore, and one requires a prescription.
Why Your Period Is Late in the First Place
Your menstrual cycle is controlled by a chain of hormonal signals that runs from your brain to your ovaries to your uterus. Stress is one of the most common disruptors. When your body is under physical or emotional strain, it releases chemicals that directly suppress the brain signal responsible for triggering ovulation. No ovulation means no progesterone rise, and no progesterone rise means no progesterone drop, which is the actual trigger that causes your uterine lining to break down and shed as a period.
Other common causes of a late or missing period include sudden weight loss, under-eating, over-exercising, travel, illness, thyroid problems, and polycystic ovary syndrome (PCOS). Hormonal birth control can also delay the return of regular cycles after you stop using it. And, of course, pregnancy. Before trying anything on this list, rule out pregnancy with a test. This matters for safety reasons covered below.
Address Stress, Sleep, and Nutrition
If stress is the culprit, your period won’t come until your body decides conditions are safe enough to ovulate. That sounds vague, but it translates into concrete steps: prioritize sleep, reduce intense exercise temporarily, and eat enough calories. For women whose periods have stopped due to low energy availability (common in athletes and those restricting food intake), the recommended target is about 15 calories per pound of body weight in “available energy.” That means calories eaten minus calories burned through exercise. For a 130-pound person, that’s roughly 1,950 calories before accounting for any workout. If you ran and burned 600 calories, you’d need around 2,550 for the day.
This isn’t a quick fix. Restoring a period lost to under-fueling or excessive exercise can take weeks to months. But it’s the only approach that addresses the root cause rather than masking it.
Vitamin C and Herbal Remedies
You’ll find countless recommendations online for vitamin C, parsley tea, ginger, and other herbal remedies. Here’s what the evidence actually shows.
Vitamin C (ascorbic acid) may modestly raise estrogen levels. In one study, women taking 1,000 mg daily saw an average 21% increase in estrogen after one month, with larger increases in women who started with the lowest levels. The theory is that higher estrogen could help build the uterine lining and push the cycle forward. But this study was conducted in postmenopausal women on hormone replacement therapy, not in younger women with late periods. There are no clinical trials confirming that vitamin C reliably triggers a period.
Herbs like mugwort, rue, and parsley are traditionally called “emmenagogues,” meaning they’re believed to stimulate menstrual flow. While roughly 43% of plants historically used this way have been shown to stimulate uterine tissue in lab settings, mainstream clinical research on these herbs is almost nonexistent. The leap from “causes cells to react in a petri dish” to “safely starts your period” is enormous. Herbal remedies for inducing periods are unregulated, under-researched, and unpredictable in their effects.
Why Herbal Methods Carry Real Risk
This deserves its own section because the dangers are serious and underreported. Many traditional emmenagogue herbs double as abortifacients, and using them without knowing whether you’re pregnant can be dangerous. Common rue, for example, has been associated with severe vomiting, liver damage, anemia, and in some cases respiratory distress and death. In a case series of 86 women who used herbal products to induce abortion, all developed gastrointestinal problems, 14 developed organ failure or blood poisoning, several required hysterectomies, and five died.
Pennyroyal oil, another commonly cited remedy, is a known liver toxin. These aren’t theoretical risks from massive overdoses. They’re documented outcomes from people using these herbs for exactly the purpose you’re considering. If your period is simply late due to stress or a skipped ovulation, these herbs are not worth the risk for something your body will likely resolve on its own.
Heat, Exercise, and Orgasm
Applying heat to your lower abdomen with a heating pad or taking a warm bath increases blood flow to the pelvic region. This is well-established for relieving menstrual cramps once your period has started, but there’s no strong evidence it can trigger a period that hasn’t begun. That said, it’s harmless and may help you feel more comfortable while waiting.
Moderate exercise can help regulate your cycle over time by reducing stress hormones and improving insulin sensitivity, both of which support healthy ovulation. The key word is moderate. Intense exercise does the opposite and can delay your period further.
Orgasm causes a surge of oxytocin, which triggers uterine contractions. This has led to the popular belief that sex or masturbation can jumpstart a period. Research has looked into this directly and found that while orgasm does cause the uterus to contract, these contractions are short-lived and don’t mimic the sustained contractions of menstruation. If your period is already on the verge of starting (you’re spotting or cramping), an orgasm might move things along by a few hours. It won’t trigger a period that’s days away.
The Medical Option: Progesterone
If your period is significantly late and your doctor has ruled out pregnancy and other underlying conditions, they may prescribe a short course of a synthetic progesterone. The standard approach is taking it daily for 5 to 10 days. Once you stop, the drop in progesterone mimics what happens naturally at the end of a cycle, and your uterine lining sheds. Withdrawal bleeding typically starts within 3 to 7 days after the last pill.
This is the most reliable method for inducing a period, but it only works if your body has built up a uterine lining in the first place (meaning you’ve had some estrogen activity). It also doesn’t fix whatever caused the delay. Your doctor will likely want to investigate why your period stopped, especially if it’s a recurring problem.
When a Late Period Needs Medical Attention
A period that’s a few days late is usually nothing to worry about. Cycles vary from month to month, and occasional irregularity is normal. But if your period has been absent for three months or more without explanation, that meets the clinical definition of secondary amenorrhea, and the American College of Obstetricians and Gynecologists recommends evaluation at that point regardless of your age. Prolonged absence of periods can signal hormonal imbalances, thyroid disorders, pituitary problems, or premature ovarian insufficiency, all of which are treatable but need proper diagnosis.