Your period ghosted you again. Here's the actual reason (and it's fixable).

If you have polycystic ovary syndrome (PCOS) and your periods come every 35, 60, or 90 days (or you skip them entirely for months at a stretch), the underlying reason is almost always the same: you are not ovulating consistently. The medical term is anovulation, and it is the single most common cause of irregular cycles in PCOS, also known as polycystic ovary syndrome (the spelled-out form), polycystic ovaries, or polycystic ovarian disease (PCOD) in much of South Asia. Anovulation is not random. It has a clear hormonal mechanism, and once you understand it, the path to more regular cycles becomes far less mysterious.

What is actually happening in a PCOS cycle

In a typical menstrual cycle, a follicle in one ovary matures, releases an egg (ovulation), and then becomes the corpus luteum, which produces progesterone. Progesterone signals the uterine lining to shed roughly 14 days later. That is your period.

In a cycle without ovulation, no follicle releases. No corpus luteum forms. No progesterone surge. So the lining keeps building under estrogen alone for weeks or months, until it eventually breaks down erratically. That breakdown is what looks like a period to you, but biologically it is something different called withdrawal bleeding or breakthrough bleeding (NIH NICHD on PCOS).

This is why PCOS bleeds can be so unpredictable. Light, heavy, late, missing entirely, then suddenly present. It is not your cycle being broken in small ways. It is the absence of the ovulation event the cycle is built around.

Why ovulation does not happen in PCOS

Three drivers, usually stacked:

1. High insulin from insulin resistance. Up to 70% of women with PCOS have some degree of insulin resistance (Endocrine Reviews). Elevated insulin signals the ovaries to produce more androgens, and high androgens disrupt the orderly maturation of follicles.
2. Elevated LH relative to FSH. In PCOS the pituitary often releases luteinizing hormone (LH) at higher pulses than follicle-stimulating hormone (FSH). This pattern keeps follicles small and stuck, never reaching the size needed to ovulate.
3. Elevated androgens directly. High testosterone and DHEA-S interfere with follicle selection. Multiple small follicles develop, none becomes dominant, and the result on ultrasound is the classic "string of pearls" appearance of polycystic ovaries.

Translation: PCOS irregular periods are downstream of insulin and androgens, not of stress or "irregular hormones" in some vague sense. Lower the insulin and androgens, and ovulation usually returns.

What actually restores cycles

The interventions with the cleanest evidence:

1. Resistance training and post-meal walking. Both improve insulin sensitivity, which lowers androgens, which lets follicles mature (Sports Medicine).
2. Inositol, 4 g myo plus 100 mg d-chiro daily, in a 40:1 ratio. Multiple trials show improved ovulation rates over three to six months (Cochrane review).
3. Adequate protein and fiber. A protein-anchored breakfast and 25 to 35 g of fiber a day flatten the post-meal insulin curve over weeks.
4. Sleep, seven to nine hours. Sleep loss raises both insulin resistance and cortisol, both of which suppress ovulation (Annals of Internal Medicine).
5. Metformin or letrozole, when prescribed. For some women, especially those with severe insulin resistance or trying to conceive, prescription support is the right call. Letrozole is now first-line for ovulation induction in PCOS (ACOG guidance).

Most of the women who return to a regular cycle do so through the first three, given enough time. Three to six months is a realistic window for visible change.

What does not usually work

• Birth control as a "cycle regulator." Hormonal birth control gives you a predictable monthly bleed, but it does not restore ovulation. It hides the underlying picture rather than fixing it. Birth control has its place, especially for symptom relief, but be clear about what it is doing.
• Cycle teas and seed cycling. Both are popular online, neither has good evidence in PCOS. The risk is mostly opportunity cost: time spent on these is time not spent on the things that work.
• Aggressive calorie restriction. Often makes ovulation worse, not better, by stressing the hypothalamic-pituitary axis.

Tracking ovulation when your cycles are irregular

The hard part with polycystic ovaries is that standard ovulation tracking (calendar method, OPK kits) often does not work because cycles are unpredictable.

What does work:

• Basal body temperature (BBT) charted daily. A sustained 0.4°F rise indicates ovulation has happened.
• Mid-luteal progesterone drawn around 7 days after suspected ovulation. A value above 3 ng/mL confirms ovulation.
• Pelvic ultrasound during the cycle, in some cases, if your clinician is investigating fertility.

If you are trying to conceive, do not rely on OPKs alone in PCOS. The LH baseline is often elevated, which produces false-positive readings. Talk to a clinician about a more accurate approach.

When to talk to a clinician

Three situations warrant a workup sooner rather than later:

• Cycles longer than 35 days for several months in a row, especially if paired with acne, hirsutism, or weight changes
• Periods that have stopped entirely for three or more months
• Active attempts to conceive with no luck after six months (over 35, after three months)

A proper PCOS workup includes fasting insulin, glucose, HbA1c, free and total testosterone, sex-hormone-binding globulin, DHEA-S, prolactin, thyroid panel, and pelvic ultrasound. If you have not had this complete picture, ask for it.

Track the patterns

The fastest way to see whether your cycle is moving is to log it alongside food, sleep, and symptoms. Balance App is built for exactly this: log meals by voice, photo, or text and Balance correlates them with how your cycle and symptoms move over weeks.

Not sure whether what you have is PCOS in the first place? The two-minute PCOS quiz walks the same Rotterdam-criteria signals a clinician would and gives you a personal read-out.