Irregular Periods, Persistent Acne, Rapid Weight Gain: Check for PMOS, a Hormonal Disorder Unknown to 70% of Women

Irregular menstruation, persistent acne, and easy weight gain may not be normal but warning signs.“PMOS”A hormonal and metabolic disorder that 1 in 8 women are at risk of, with over 70% unaware.

Minor symptoms many women ignore—such as irregular periods, persistent acne, or unexplained weight gain—could be early warnings of a chronic illness. Data from the World Health Organization (WHO) shows over 70% of affected women do not realize they have this condition.

Associate Professor Dr. Sirilak Tanthanavipas, a specialist in obstetrics and gynecology,reproductive medicine,and gynecologic laparoscopic surgery at Vimut Hospital, shared knowledge about this disease to help women recognize warning signs and seek proper treatment.

Understanding PMOS, the new name for PCOS, which affects more than just the ovaries.

Many are familiar with PCOS (Polycystic Ovary Syndrome), or“polycystic ovary condition.”Recently, medical experts renamed it PMOS (Polyendocrine Metabolic Ovarian Syndrome), or“polyendocrine metabolic ovarian syndrome.”This change was made because the old name often led to misunderstanding that it was solely about ovarian cysts requiring surgery.

In reality, what is seen in the ovary is“follicles,”which are normally present in menstruating women. The abnormality in PMOS is having multiple follicles caused by hormonal imbalances that prevent ovulation. This condition affects not only the ovaries but also disrupts hormonal and metabolic systems throughout the body.

The exact cause of PMOS remains unclear, but it is linked in a cycle involving three main factors: insulin resistance, excess male hormones, and anovulation.

When insulin resistance develops, insulin production increases, stimulating higher male hormone levels. Both factors together prevent ovulation. The abnormal ovarian hormones causing anovulation then further raise male hormone levels. Moreover, if the patient is“obese,”this worsens the cycle from insulin resistance to anovulation.

Urgent check! Three main warning signs of PMOS—risk applies to both thin and overweight individuals.

Many overlook early symptoms because they don't know what a normal menstrual cycle should be or believe infrequent periods are convenient. Associate Professor Dr. Sirilak Tanthanavipas offers three main self-check criteria:

1. Irregular menstrual cycles: Normally, cycles range from 21–35 days. Periods occurring more frequently than every 21 days or less often than every 35 days regularly, or having fewer than eight periods per year, are abnormal (except adolescents within 3 years of menarche, where cycles may vary; if cycles exceed 45 days, see a doctor).
2. Signs of excess male hormones: Noted by many acne, oily skin, excessive body hair, or hair loss.
3. Easy weight gain: Weight increases despite unchanged eating habits.

Many believe only overweight individuals have this condition, but statistics show 30–50% of PMOS patients have normal or thin body types. Regardless of body shape, anyone with these symptoms should not ignore them.

Ignoring PMOS is dangerous—it is the starting point for“diabetes, cancer, and heart disease.”

If untreated, PMOS progressively damages various bodily systems long-term as follows:

PMOS screening and treatment are simpler than expected, with no need for internal exams.

Checking for PMOS is neither complicated nor intimidating and does not require internal exams as many women fear. Start by tracking menstrual cycles for 2–3 months. If abnormalities appear, doctors will take history, perform physical exams, blood tests, and possibly ultrasound based on medical indications.

Current treatments focus on medication and lifestyle changes without surgery (except when other conditions require it), consisting of three main approaches.

• Hormones and medication: Doctors prescribe drugs tailored to individual symptoms.
• Blood screening tests: To monitor endocrine and metabolic system abnormalities.
• Lifestyle modification: For overweight patients, losing about 5% of body weight significantly helps rebalance hormones.

Tracking menstrual cycles is the simplest, cost-free health check starting point. Early PMOS detection allows better planning for treatment and prevention of serious future diseases.

PMOS, or“polyendocrine metabolic ovarian syndrome,”is a common condition in reproductive-age women affecting hormonal and metabolic systems. Though early symptoms like acne, delayed periods, or easy weight gain may seem minor, neglecting treatment can lead to serious health problems such as diabetes, heart disease, and uterine lining cancer long term. Regular self-monitoring and early medical consultation and lifestyle adjustment are key to restoring lasting health balance.