What Causes PCOD? A Simple Explanation of Why It Happens
By Samay K, Certified Nutrition Coach (Precision Nutrition Level 1)
Last updated: 6 November 2026
PCOD happens when the body’s hormone balance is disturbed: the ovaries make more male hormones (androgens) than usual, and the egg does not mature and release properly each month. There is no single cause. Most often, insulin resistance, genes passed down in the family, rising weight, ongoing stress and poor sleep work together. Whether you have PCOD, and what kind, is something only your gynaecologist can confirm after tests.
The sonography report says “polycystic ovaries”, and the doctor adds one line: try to lose some weight. Then come the questions. Why me? Was it something I ate? Did my mother have it too? Relatives say “everyone has it these days”, and every website says something different.
These are fair questions. Once you understand why PCOD happens, the fear gets smaller, and it becomes clear where daily habits fit into the story.
What PCOD actually is
In everyday talk, PCOD (Polycystic Ovarian Disease) and PCOS (Polycystic Ovary Syndrome) are used for the same kind of problem. Doctors sometimes draw a line between the two; which name fits your case is for your gynaecologist to say.
Every month, several small follicles form in the ovary. A follicle is a tiny sac in which an egg matures. Normally one of them matures fully and releases its egg. In PCOD, hormone signals get mixed up, so many follicles stop halfway. These half-grown follicles look like small beads on a sonography scan and are called “cysts”. The word sounds frightening, as if there are lumps in the ovary, but they are usually follicles that did not finish growing.
The same imbalance shows up differently in different women: periods that come early or late, pimples or hair on the face, thinning hair on the head, and weight, especially around the belly. Some women have all of these. Others have only one or two.
How PCOD works: the cycle inside
Think of PCOD as a cycle. The body’s sugar-handling system and the ovaries’ hormone system are connected. When one goes off track, the other follows.
In most women with PCOD, the body does not respond well to insulin, so it makes more insulin to compensate. This extra insulin tells the ovaries to make more male hormones. Higher male hormones stop follicles from maturing and drive symptoms like pimples, facial hair and belly fat. Extra insulin also tells the body to store fat, and that extra fat makes the body respond to insulin even less. So the cycle keeps feeding itself.
The 5 main causes of PCOD
1. Insulin resistance
This is the most common root of PCOD. In simple words, the body does not listen to insulin properly, so it keeps making more. It is not only a problem for women who are overweight. Slim women can have insulin resistance and PCOD too, which is why “I’m thin, how did I get this?” is such a common question.
2. Genes and family history
If your mother, sister or aunt has had PCOD, or diabetes runs in the family, your risk is higher. Genes prepare the ground; daily habits decide what grows on it and how much. That is why two sisters in the same house can have PCOD that looks quite different.
3. Low-grade inflammation inside the body
Many women with PCOD have a mild, ongoing inflammation inside the body. You cannot see it from outside, but it nudges the ovaries towards making more male hormones. Packaged food, short sleep and constant stress are the kind of things that can keep this inflammation going.
4. Rising weight
With PCOD, weight is both a cause and a result. Fat around the belly increases insulin resistance, and insulin resistance stores more fat. So weight speeds up the PCOD cycle. If you have wondered why weight is so stubborn with PCOD, this cycle is the reason. How the cycle breaks is explained on our PCOD weight loss page.
5. Stress and poor sleep
Under constant stress, the body makes more of its stress hormone, which also unsettles the sugar and insulin system. Poor sleep raises hunger and sweet cravings the next day. Late nights on the phone, running between home and work, and never having time for yourself all quietly affect hormone balance.
Common beliefs about PCOD, and what is really going on
| What people often believe | What is really going on |
|---|---|
| “Only overweight women get PCOD.” | Slim women get it too; insulin resistance and genes work even without extra weight. |
| “Eating sweets caused my PCOD.” | No single food causes PCOD; the overall eating pattern affects insulin. |
| “There are lumps in my ovary.” | The “cysts” are usually half-grown follicles; treatment decisions are your gynaecologist’s. |
| “It is only a period problem.” | It is linked to the whole body’s hormone and sugar system. |
| “My mother had it, so there is nothing I can do.” | Genes raise the risk; habits shape how strongly the symptoms show. |
| “No symptoms means no PCOD.” | Symptoms can be mild in many women; only tests by your doctor can tell. |
Why this matters even more after 35
PCOD is often thought of as a young woman’s problem, but it does not simply end with age; it changes shape. After 35, muscle starts to decline slowly, and the effect of insulin resistance becomes more visible. Women with PCOD also have a higher risk of diabetes, blood pressure and cholesterol problems later in life. That is why doctors recommend regular check-ups, and why understanding the cause of PCOD is about long-term health, not just weight.
So where do daily habits fit in?
You cannot change your genes. But much of the rest of the PCOD story is tied to daily life: the pattern of eating, sleep, stress and how much you move through the day. These are the parts where habits can make a difference, and it is why doctors put so much weight on lifestyle in PCOD. PCOD is managed over the long term, and every body responds differently.
Which habit to start with, and how, depends on each woman’s routine, age and reports. That is exactly what coaching sets for each person, and it goes beyond what an article can do. You do not have to climb a mountain; you take one small step, then the next. Every decision about medicines and tests belongs to your gynaecologist.
With my PCOD clients, I start by understanding their routine: what is cooked at home, how they sleep, when the cravings come and where the stress in their day comes from. Every plan is built from that, so no two clients ever get the same plan. Many of my PCOD clients notice a change in energy, mood, cravings and the glow on their face in about the first two weeks, and changes in weight from the third week. Every body responds differently, so in the assessment we give you a realistic picture for your situation.
Start with 15 minutes
If you’d like to know what to change in your routine, take a free 15-minute assessment with our coach on WhatsApp. Keep your recent reports handy; we do look at them, but diagnosis and treatment are your gynaecologist’s job. No clinic visit, no obligation.
15 minutes · Free · No obligation
Frequently asked questions
Are PCOD and PCOS the same thing?
In everyday use, both names are used for the same kind of problem, and in both the hormone balance is disturbed. Doctors sometimes separate the two. Your gynaecologist can tell you which name fits your case.
Can slim women get PCOD?
Yes. PCOD is not caused by weight alone. Insulin resistance, genes and stress work in slim women too. If you have symptoms even at a healthy weight, get checked by your doctor.
How is PCOD diagnosed?
A gynaecologist diagnoses PCOD by looking at your symptoms, blood tests and, if needed, a sonography. Don’t diagnose yourself from one symptom or an internet checklist, because other problems can cause similar signs.
Can stress cause PCOD?
Stress alone is not considered the cause of PCOD, but constant stress and poor sleep unsettle the hormone and insulin systems. This can make PCOD symptoms stronger. That is why sleep and stress matter as much as food in PCOD.
This article is for information only and is not medical advice. Please make decisions about your health with your doctor.
