The Two Distinct Phases of Your 30s

Your 30s can be thought of as a decade of two halves. In your early 30s, you might find that your cycle is similar to your 20s, and as you progress into your late 30s, changes become more noticeable.

Early 30s

In your early 30s, you will likely continue to have regular cycles. If you don't have underlying conditions such as Polycystic Ovary Syndrome (PCOS) or endometriosis, generally you can keep your cycles stable by maintaining a healthy lifestyle, managing stress, and having regular check-ups.

Mid to Late 30s

As you move into your late 30s, you may experience more noticeable changes, including:

1. Fertility

As you age, your ovarian reserve naturally declines. This decline is more pronounced after the age of 35, with fewer high-quality eggs available for fertilization. If you are older than 35 and have not been able to conceive after 6 months of having regular sex without birth control, talk with your OB-GYN about an infertility evaluation.

2. Hormonal shifts

Hormonal fluctuations become especially pronounced as you approach your late 30s. These shifts can cause changes in menstrual cycle regularity and symptoms. Increased levels of estrogen relative to progesterone can result in heavier periods and more severe PMS symptoms, including mood swings and bloating.

3. Metabolic rate

Metabolic rate tends to slow down with age, leading to potential weight gain if dietary and exercise habits remain unchanged. Increased body weight can affect menstrual regularity, often causing irregular periods. Additionally, changes in insulin sensitivity can influence menstrual cycles, particularly if PCOS develops.

How Does Childbirth Impact the Menstrual Cycle?

Childbirth and the postpartum period bring significant hormonal changes. After giving birth, it can take several months for your period to return. Breastfeeding can further delay the return of regular cycles due to the hormone prolactin, which suppresses ovulation. Most women regain their menstrual cycles within a year after giving birth.

It is also important to differentiate the difference between postpartum bleeding (lochia) and postpartum period. To learn more, read: Postpartum Bleeding.

NEXT: Period in Your 40s: Embracing the Changes