Can irregular periods affect fertility?

Yes, significantly. Irregular periods often indicate irregular or absent ovulation. Without ovulation, conception is not possible in that cycle. Conditions that cause irregular cycles, such as PCOS and thyroid dysfunction, also affect fertility directly. If conception is a goal and cycles are irregular, earlier evaluation is better than waiting.

Do irregular periods always mean something is wrong?

Not always. Some variation is normal, and irregularity in the first years of menstruation or approaching perimenopause is expected. Persistent irregularity outside the normal range (21 to 35 days) or a significant change from your personal baseline is more likely to represent something worth evaluating.

What blood tests are typically ordered for irregular periods?

Common tests include thyroid stimulating hormone (TSH), prolactin, FSH, LH, and androgens including testosterone and DHEA-S. Fasting blood glucose and insulin may be ordered if PCOS is suspected. The specific tests depend on the clinical picture and what your provider considers most likely.

Is my irregular cycle tracking data sensitive?

Yes. Irregular cycles may indicate PCOS, fertility issues, or hormonal conditions. Apps storing this data on servers can share it with advertisers or produce it in legal proceedings. Flo Health was cited by the FTC in 2021 for sharing period data with Facebook and Google. On-device tracking keeps this data on your phone only, with no third-party access.

condition-guides

Irregular Period Causes: What Changes Your Cycle

Irregular periods have specific, identifiable causes. This guide covers PCOS, thyroid dysfunction, stress, and other causes. Learn what to track for each.

Why Cycles Go Irregular: The Core Mechanism A regular menstrual cycle depends on a precisely timed hormonal conversation between the hypothalamus, the pituitary gland, and the ovaries. Anything that disrupts that conversation can change when or whether ovulation occurs, which in turn changes when or whether a period follows. Understanding this chain helps explain why so many different things can produce irregular cycles: the disruption can happen at any point along the axis, and the cycle is downstream of all of it. This guide is for educational purposes only and is not a substitute for medical advice. Cause 1: PCOS Polycystic ovary syndrome is one of the most common hormonal conditions affecting people with ovaries. In PCOS, elevated androgen levels disrupt the normal development of follicles in the ovaries. Instead of one follicle maturing and releasing an egg, multiple follicles begin developing but stall. The result is irregular or absent ovulation, and consequently irregular or absent periods. The irregularity pattern with PCOS tends to be unpredictable: cycles may range from 35 to 90 days or longer, may come inconsistently, or may be absent for months at a time. Flow when it