Understanding Anovulatory Cycles

An anovulatory cycle is a menstrual cycle in which ovulation does not occur. Without ovulation, the body does not enter the luteal phase and progesterone is not produced. Instead, the cycle consists of an extended follicular phase driven by oestrogen, which may eventually lead to a breakthrough bleed. This is a type of bleeding that is not triggered by the normal drop in progesterone associated with ovulation.

Because progesterone typically helps regulate bleeding and reduce its intensity, its absence can result in heavier or prolonged bleeding during an anovulatory cycle.

These types of cycles are sometimes referred to as:

• Hormonal imbalance
• Oestrogen and progesterone imbalance
• Ovulatory dysfunction
• Unopposed oestrogen
• Dysfunctional uterine bleeding

If not addressed, frequent anovulatory cycles can contribute to endometrial overgrowth, increasing the risk of conditions such as endometrial hyperplasia or uterine polyps.

What Causes Anovulatory Cycles?

It is not unusual to experience the occasional anovulatory cycle. However, if they happen regularly, potential underlying factors may include:

• Polycystic Ovary Syndrome (PCOS)
• Elevated prolactin levels
• Hypothalamic amenorrhea (often related to stress or low caloric intake)
• Post-hormonal birth control recovery
• Perimenopause

How Daysy Helps You Recognise Anovulatory Cycles

Daysy can detect anovulatory cycles because it combines:

• A precise temperature sensor that captures the most accurate data reading
• A unique, intelligent algorithm built on a database of 5 million menstrual cycles
• An intuitively designed tracker that eliminates the potential for user error

Here is how anovulatory cycles may show up in your Daysy data:

• Cycle length under 21 days: A full menstrual cycle shorter than 21 days usually does not allow enough time for ovulation and a luteal phase, suggesting it may be anovulatory.
• Cycle longer than 35 to 45 days: A lengthy cycle could indicate either a prolonged follicular phase without ovulation, or no ovulation at all. The luteal phase is typically fixed at 12 to 16 days, so anything significantly beyond that timeframe (unless pregnant) often points to anovulation.
• Menstrual bleeding lasting more than 7 days: A healthy period usually lasts 2 to 7 days. Bleeding that continues beyond a week may suggest hormonal imbalance and an absence of ovulation.
• No sustained rise in basal body temperature: Progesterone causes a noticeable and sustained rise in BBT after ovulation. When Daysy does not detect this thermal shift, it indicates a prolonged fertile (red) phase with no confirmed ovulation.

Important Note: Withdrawal Bleeds on the Pill Are Not True Periods

If you are using hormonal birth control, it is important to know that pill bleeds are not menstrual periods. While you may bleed monthly, this is not due to ovulation, because ovulation is suppressed by the hormones in the pill. Hormone levels during this time do not reflect a natural cycle, and there is no progesterone rise or luteal phase.

Why Monitoring Matters

With Daysy's advanced cycle tracking, you can understand your ovulation patterns over time. Regular temperature tracking provides clarity on whether you are ovulating, helping you identify potential irregularities like anovulatory cycles early. This insight is valuable for fertility awareness, hormonal health, or simply understanding your body more deeply.