Key takeaways:
Moderate alcohol intake or a single episode of binge drinking is unlikely to change your period in a major way.
Long-term heavy drinking can change hormone levels and may lead to irregular or missed periods, heavier bleeding, and worse premenstrual syndrome (PMS) symptoms.
Many things besides alcohol can affect your menstrual cycle. Talk with your healthcare team if your periods become irregular or you miss your period.
If your period is late or different than usual after you’ve been drinking, it’s natural to wonder if alcohol is the reason.
The good news is that having an occasional drink or even a single night of heavier drinking is unlikely to cause major changes to your menstrual cycle. But drinking heavily over a long period of time can affect your hormones. This may lead to irregular periods and other menstrual cycle changes. Here’s what researchers know about how alcohol affects your period.
What is a regular menstrual cycle?
A regular menstrual cycle is a series of natural changes in the female reproductive system. A typical cycle lasts about 28 days, but it can range from 21 to 35 days. The cycle starts on the first day of your period and ends the day before your next period begins.
The menstrual cycle is divided into these phases:
Menstruation (days 1-5): This is when your body sheds the lining of your uterus, causing your period.
Follicular phase (days 1-13): This phase starts on the first day of your period and lasts until ovulation. During this time, an egg develops inside a small sac called a follicle in one of your ovaries.
Ovulation (around day 14): In the middle of your cycle, a mature egg is released for possible fertilization.
Luteal phase (days 15-28): After ovulation, the follicle that released the egg changes into the corpus luteum, preparing your uterus for pregnancy. If no pregnancy happens, the corpus luteum breaks down, triggering your period.
A regular menstrual cycle is a sign of good reproductive health.
How does drinking alcohol affect your period?
Drinking alcohol can affect the hormones that control your menstrual cycle. But how much alcohol affects your period depends on how often and how much you drink.
Having a few drinks a week usually doesn’t seem to cause changes to your period, even though it can temporarily change hormone levels. Binge drinking may affect fertility during that cycle, but it isn’t known to cause major changes to your period.
Long-term heavy drinking is much more likely to disrupt your menstrual cycle because it changes hormone levels over time. Research has linked heavy alcohol use with:
Irregular or missed periods
Heavier bleeding
Longer periods
Researchers are still learning how alcohol affects the menstrual cycle. Much of the available research is from older studies, some of which were done in the 1980s. So, more up-to-date research is needed.
How long can alcohol delay your period?
It’s unlikely that light or moderate alcohol intake will delay your period. A single episode of binge drinking could affect your menstrual cycle, but there isn’t good evidence that it usually delays a period.
Most research suggests that long-term heavy alcohol use is much more likely to affect the hormones that control your menstrual cycle. This can lead to missed or irregular periods.
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Many other factors can also affect when your period starts, including:
Overall health
Stress levels
Eating habits
Sleep patterns
Recent illnesses
Recent travel
If you haven’t had your period for 3 months and you’re not pregnant, make an appointment with a healthcare professional. They can help find the cause of your missed periods and recommend treatment if needed.
When should you see your doctor about irregular periods?
Whether or not you drink alcohol, it’s important to pay attention to changes in your menstrual cycle. Make an appointment with a healthcare professional if you notice any of the following:
Missed periods
Periods that suddenly become much more or less frequent
Very heavy bleeding or bleeding between periods, after sex, or after menopause
Severe menstrual cramps or cramps that suddenly become much more painful
Pelvic pain, unusual vaginal discharge, or changes in your bowel or bladder habits
Irregular periods if you have a condition that can affect your cycle, such as polyendocrine metabolic ovarian syndrome (PMOS), diabetes, or a thyroid condition
Frequently asked questions
It’s not clear whether drinking alcohol during your period makes you bleed more. Alcohol can affect your body’s ability to form blood clots, so it’s possible that heavy drinking could increase menstrual bleeding. Talk with your healthcare team if you already have heavy periods, a bleeding disorder, or take blood-thinning medication. They can help you decide whether it’s safe to consume alcohol during your period.
Heavy drinking may affect ovulation and fertility. It may also affect the lining of your uterus and egg quality. Researchers are still learning how much alcohol causes these changes. Drinking less alcohol is one of the best ways to support your overall health.
The 20-minute rule for alcohol is a strategy some people use to help them drink less alcohol. It involves waiting 20 minutes between finishing an alcoholic beverage and starting another. There’s no research looking at whether this strategy is effective.
It’s not clear whether drinking alcohol during your period makes you bleed more. Alcohol can affect your body’s ability to form blood clots, so it’s possible that heavy drinking could increase menstrual bleeding. Talk with your healthcare team if you already have heavy periods, a bleeding disorder, or take blood-thinning medication. They can help you decide whether it’s safe to consume alcohol during your period.
Heavy drinking may affect ovulation and fertility. It may also affect the lining of your uterus and egg quality. Researchers are still learning how much alcohol causes these changes. Drinking less alcohol is one of the best ways to support your overall health.
The 20-minute rule for alcohol is a strategy some people use to help them drink less alcohol. It involves waiting 20 minutes between finishing an alcoholic beverage and starting another. There’s no research looking at whether this strategy is effective.
The bottom line
Occasional alcohol use probably won’t have a lasting effect on your menstrual cycle. But drinking heavily over time can affect the hormones that help regulate your period and make menstrual changes more likely. Because many factors can cause irregular periods, don’t assume alcohol is the only reason for changes in your cycle. Talk with your healthcare team if your periods are irregular or you notice other concerning symptoms.
Why trust our experts?
References
Anwar, M. Y., et al. (2021). The association between alcohol intake and fecundability during menstrual cycle phases. Human Reproduction.
Becker, U., et al. (1989). Menstrual disturbances and fertility in chronic alcoholic women. Drug and Alcohol Dependence.
Carroll, H. A., et al. (2015). The relationship between alcohol consumption and menstrual cycle: A review of the literature. Archives of Women’s Mental Health.
Fernández, M. D. M., et al. (2018). Premenstrual syndrome and alcohol consumption: A systematic review and meta-analysis. BMJ Open.
Lyngsø, J., et al. (2014). Moderate alcohol intake and menstrual cycle characteristics. Human Reproduction.
Rachdaoui, N., et al. (2017). Pathophysiology of the effects of alcohol abuse on the endocrine system. Alcohol Research: Current Reviews.
Reed, B. G., et al. (2018). The normal menstrual cycle and the control of ovulation. Endotext.
Schliep, K. C., et al. (2015). Alcohol intake, reproductive hormones, and menstrual cycle function: A prospective cohort study. The American Journal of Clinical Nutrition.
Wilsnack, S. C., et al. (1984). Drinking and reproductive dysfunction among women in a 1981 national survey. Alcoholism, Clinical and Experimental Research.
