🔄 Irregular Menstrual Cycle Perimenopause Simulator

Regular Ovulatory Cycles Before Perimenopause

A short placeholder overview of normal ovulatory cycling.

• 21–35d: Typical cycle length (Placeholder reference range)
• ~14d: Luteal phase length (Placeholder consistency)
• ~95%: Ovulation rate (Placeholder cycles ovulatory)
• <7d: Cycle-to-cycle variance (Placeholder variability)

Hormonal rhythm baseline

Placeholder: FSH, LH, estrogen, progesterone cycle predictably.

Follicular reserve context

Placeholder: ovarian reserve still supports regular ovulation.

First Anovulatory Cycles Appear

A short placeholder overview of emerging anovulatory cycles.

• ~20%: Anovulatory cycle rate (Placeholder early perimenopause)
• Rising: FSH trend (Placeholder hormone shift)
• Falling: AMH trend (Placeholder reserve marker)
• ~40–45: Typical onset age (Placeholder age range)

Follicle response decline

Placeholder: fewer follicles respond fully each cycle.

Progesterone deficiency

Placeholder: skipped ovulation means no luteal progesterone.

Widening Cycle-To-Cycle Variability

A short placeholder overview of increasing cycle variability.

• >7d: Cycle variance (Placeholder diagnostic threshold)
• Late peri: STRAW +10 stage (Placeholder staging marker)
• Rising: Skipped cycle frequency (Placeholder trend)
• Common: Symptom overlap (Placeholder vasomotor symptoms)

STRAW +10 staging criteria

Placeholder: variability of 7+ days defines late transition.

Tracking cycle variability

Placeholder: menstrual diaries help quantify true variability.

Heavy Bleeding and Skipped Cycles

A short placeholder overview of bleeding pattern shifts.

• ~30%: Heavy bleeding prevalence (Placeholder perimenopausal women)
• >60d: Skipped cycle threshold (Placeholder amenorrhea flag)
• Elevated: Iron deficiency risk (Placeholder with heavy flow)
• Possible: Endometrial thickening risk (Placeholder unopposed estrogen)

Unopposed estrogen effect

Placeholder: anovulation leaves estrogen unopposed by progesterone.

Bleeding severity spectrum

Placeholder: flow ranges from light spotting to menorrhagia.

When Irregular Bleeding Needs Evaluation

A short placeholder overview of red-flag evaluation criteria.

• Evaluate: Bleeding >7 days (Placeholder red flag)
• Evaluate: Post-coital bleeding (Placeholder red flag)
• Evaluate: Bleeding after 12mo gap (Placeholder postmenopausal rule)
• Evaluate: Soaking pad hourly (Placeholder acute flag)

Red flag bleeding patterns

Placeholder: certain patterns need prompt gynecologic workup.

Ruling out pathology

Placeholder: ultrasound and biopsy exclude structural causes.

Reassurance vs referral

Placeholder: most irregularity is benign perimenopausal transition.

Placeholder: seek care for unusually heavy or prolonged bleeding.