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PCOS, Polycystic Ovary Syndrome

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What is PolyCystic Ovary Syndrome (PCOS)?

Polycystic Ovary Syndrome (PCOS) is an endocrine (hormone) and metabolic disorder that affects between 6 and 20% of women. It impacts many hormones, including androgens (such as testosterone), insulin, oestrogen, prolactin, follicle stimulating hormone (FSH) and luteinising hormone (LH). [1,2,3,4]

What are the Symptoms of PCOS?

The signs and symptoms of PCOS are primarily related to elevated levels of male hormones (androgens), and not ovulating (called anovulation). [5]

A common symptom in PCOS is irregular menstrual cycles, most often longer than 35 days, or even skipping a period completely for one or more months. Women with PCOS may have challenges conceiving and experience recurrent miscarriages. Other common symptoms are excess hair in unwanted places such as the chin, the lower belly or insides of the thighs (this is known as hirsutism), acne (typically “male-pattern”), loss of head hair and carrying excess weight. [1,6,7]

What causes PCOS?

No single cause of PCOS has been identified, and several risk factors have been identified. These are outlined below.

1. Insulin Resistance

Insulin resistance is generally accepted as the most common driver of PCOS. This occurs when sensitivity to insulin has decreased, which negatively impacts blood sugar levels. In the early stages of insulin resistance, the blood sugar may be normal, but insulin levels are elevated. This can lead to weight gain, heart disease, osteoporosis and eventually diabetes. It can also cause high male hormones (androgens) when there is genetic susceptibility to PCOS (see below). 

Too much insulin can also interfere with ovulation. Insulin also negatively impacts other hormones, such as luteinising hormone (LH) and sex hormone binding globulin (SHBG), which can also contribute to further increases in androgens. 

Insulin resistance is caused primarily by carrying excess body fat and having a diet that is high in sugar and processed foods. Smoking, stress, alcohol, and gut dysbiosis (an unhealthy balance of bacteria in the gut) may also contribute to its development and/or progression. 

Carrying excess weight around the abdomen is a typical sign of increased risk of insulin resistance, however it is also possible to be a healthy weight and still experience insulin resistance and PCOS [2,3] 

2. The Oral Contraceptive Pill

Coming off the oral contraceptive pill (“the pill”) can cause symptoms that might mimic PCOS, however this is usually temporary. As the pill supresses ovulation, it can take time for normal ovulation cycles to resume. Certain types of the pill strongly suppress androgens, and coming off them can cause a surge in androgens that can take up to a year or two to come back down again. [2,6]

3. Inflammation

Inflammation disrupts hormone receptors and suppresses ovulation – both can contribute to PCOS. Inflammation can also stimulate the adrenal glands and ovaries to produce more androgens. Conversely, PCOS is itself an inflammatory condition, where there is long-term low release of pro-inflammatory factors. [2,8]

4. Having Polycystic Ovaries

The name of the condition (polycystic ovary syndrome describes) the numerous small cysts (fluid-filled sacs) that commonly form in the ovaries in women with PCOS.  When identified on ultrasound, there are usually numerous follicular cysts about 2-6mm in diameter, which are seen on the peripheries of a classically enlarged ovary. These cysts make androgens.

It is important to be aware that some women with this disorder do not develop ovarian cysts, and up to 20% of women have cysts on their ovaries, without developing the disorder. This suggests that other factors are involved.

ovary g5ca4bab64 640.png 1

Diagram comparing the normal ovarian cycle on the left, with the process of development of multiple cysts due to halted development of follicles in PCOS on the right.

5. Genetic predisposition

About 40% of women with a family history of PCOS will have PCO, but may not develop PCOS.

Many of those who are affected often have both male and female relatives with type II diabetesobesityelevated blood triglycerides or high blood pressure. They may also have female relatives with infertilityhirsutism or menstrual problems.

In spite of these familial connections, no clear genetic link has been identified to date.

6.  Ovarian dysfunction

This can lead altered hormones, such as low oestradiol and high ovarian androgens resulting in excess androgens (male hormones).

7.  Excessive weight gain

As weight gain is the major risk factor for insulin resistance, this is considered an important modifiable risk factor. A high amount of adipose tissue leads to the conversion of androgens to oestrone. 

8.  Adrenal dysfunction

An important site for androgen production in women is the adrenal glands. Thus excessive production of androgens by the adrenals is a potential contributor to risk for polycystic ovary syndrome.

9 Certain medications.

Some medications are associated with PCO and hyperandrogenism. A common examples is the anti-epileptic medication valproate.

How is PCOS Diagnosed?

PCOS is a syndrome (essential a collection of symptoms), so diagnosis involves a full medical and menstrual history and assessing of symptoms, rather than a single, definitive test. 

The condition is generally diagnosed when a woman meets two or more of the following three criteria:

  1. Irregular or absence of periods (due to not ovulating)
  2. Many follicles in the ovaries (polycystic), identified on an ultrasound
  3. High androgens on a blood test or symptoms of high androgens, such as hirsutism.

For confirmation of the diagnosis, other reasons for high androgens (such as ovarian and adrenal gland tumours) need to be ruled out [17]. Monitoring blood sugars and cholesterol levels is also recommended. Your practitioner can also check fasting blood sugar with insulin to determine the impact that insulin resistance might be having.


An ultrasound image of a polycystic ovary. Each of the dark “holes” are cysts of varying sizes. The prescence of these cysts is not essential for the diagnosis.

It is not necessary to have polycystic ovaries for a diagnosis, and polycystic ovaries alone do not confirm diagnosis, as there are other situations when they can occur. Classification has moved away from emphasis on polycystic ovaries, and PCOS may eventually be renamed.

Some names that have been suggested are Metabolic Reproductive Syndrome (MRS) and Anovulatory Androgen Excess (AAE), as they better represent the condition. [2]

Polycystic Ovary Syndrome, Gut Health and the Microbiome

The gut microbiota refers to all the microorganisms within the digestive tract. It is so important that it may be considered an organ in its own right. The gut microbiota plays a number of key roles, not just in digestion but also metabolic health, immunity, regulation of the nervous system, drug and hormone metabolism and many others that we are continuing to learn more about through emerging research.[7]

Problems related to the gut microbiota can arise when there is a low number of beneficial microorganisms, a high level of harm-causing (or potentially harm-causing) microorganisms, or an overall low diversity of organisms (simply put, this means there is limited variety).[3]

Many studies have found connections between Polycystic Ovary Syndrome and the gut microbiota. Some of these include:

  • Women with PCOS have been found to have a lower microbial diversity, which correlates with higher androgens and impaired glucose metabolism.[8,9] 
  • In Polycystic Ovary Syndrome, there is an increased number of firmicutes (a type of bacteria that are closely related to obesity and metabolic syndrome).[10] 
  • Other imbalances include low levels of beneficial bacteria such as Akkermansia, and increased levels of potentially harmful bacteria, such as Bacteroides. Bacteroides can increase inflammation and androgens, and play a role in insulin resistance.[4,9]
  • The gut microbiota is involved in the inactivation and excretion of hormones. In PCOS, dysbiosis can result in oestrogen and testosterone being recycled back into the systemic blood circulation, increasing overall levels.[9]
  • There are many hormones produced within the gastrointestinal system that regulate things like hunger. Many of these hormones have been found to be abnormal in Polycystic Ovary Syndrome.  Altered hormones can result in faste stomach emptying , increased appetite, decreased feeling of fullness and may also impact blood sugar regulation.[8]
  • The gut microbiota also ferments fibre, producin g substances called short chain fatty acids (commonly referred to as SCFAs). In PCOS there can be abnormal SCFA metabolism because of gut dysbiosis. This is associated with increased androgens and insulin resistance. High androgens can also negatively impact the gut micro-organisms, creating a vicious cycle.[10,11]
  • The structure and function of the intestinal lining can be negatively impacted when there is inflammation, leading to increased intestinal permeability. This can cause (often undesirable) molecules from the digestive system to get through the gut lining into the blood stream.
  • Lipopolysaccharides (LPS) are a component of the cell wall of certain types of gut bacteria, and they are released when those cells die.  LPS is absorbed through the gut lining into the circulation- especially in the prescence of a high-fat diet. When there is increased intestinal permeability it is common for increased LPS to get into the circulation, something that has been shown to occur often in PCOS. LPS contributes to obesity and increased insulin and androgens.[10,12]

Medical Management of Polycystic Ovary Syndrome

A medical approach aims to manage the symptoms. Just how will depend on the woman’s stage of life and the symptoms.

Examples of strategies for specific symptoms include:

  • The oral contraceptive pill
    • To regulate periods
    • Some reduce production of male hormones
  • Metformin
    • A drug used to improve insulin resistance, and lower insulin levels.
  • Spironolactone
    • An anti-androgen drug, reduces male hormones and symptoms associated with this.

None of these pharmaceutical options are without risk of adverse effects[18].

Managing PCOS – Naturally

The single most important strategy for managing PCOS is losing excess body fat. This reduces the levels of male hormones (androgens) and improves insulin sensitivity. If a person is overweight, even a 5% reduction in body weight can significantly reduce the risk of developing type 2 diabetes and improving PCOS.


Regular, moderate levels of exercise aids in sensitising the muscles to insulin. Going for a walk after eating a meal can help with blood sugar management.. Resistance training increases metabolism at rest.[2,3,6]

It is best if an exercise regimen is implemented under guidance, as those with increased androgens may develop male-type muscularisation fairly quickly.


Dietary modification and lifestyle change go together to make sustainable changes. Increasing fibre intake aids the gut microbiota, and can aid the excretion of hormones. Increasing the intake of foods high in magnesium (e.g., Brazil nuts, dark chocolate (80%+ cacao), brown rice, legumes, cashews, spinach, almonds, pumpkin and chia seeds) and zinc (e.g., oysters, beef, pork, cashews, sunflower, hemp and pumpkin seeds) can help improve insulin sensitivity, , reduce inflammation, promote ovulation and reduce androgens. Reduction in acne lesions may also be a result.[2,14,15]

Reducing the intake of sugars and refined carbohydrates, and increasing protein intake, especially at breakfast helps keep insulin levels low and provides sustained energy, which helps reduce the temptation to snack between meals.[2] Ultimately all are beneficial.

Dietary Supplements

Myo-inositol is a nutritional supplement which can help improve insulin sensitivity, decrease androgen levels and support regular ovulation.[2,13] 

Pro and prebiotics

A probiotic is a living organism, while a prebiotic can be thought of as a food for those organisms. Both can improve microbiome diversity and insulin sensitivity, and help reduce LPS, inflammation and intestinal permeability.[9,13] 

Herbal Medicine

Some herbal medicines can be helpful to reduce androgens, improve insulin sensitivity and support restoring a healthy gut microbiota. We recommend working with a qualified herbalist who can formulate a prescription specific to your needs.

How Successful is Natural Treatment?

Some women can completely reverse PCOS by making changes to their diet and lifestyle. Determining the levels of hormones is a crucial factor in planning those changes. Evaluation of insulin levels, via a standard laboratory test, determines the role of this hormone in managing your weight. Working with a health professional who understands your health goals, who can work with you to strategise a long-term solution is key to living successfully with this condition.

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