Female Infertility
Difficulty conceiving due to various reproductive factors.
TL;DR
Difficulty conceiving after 12 months of trying (6 months over age 35). Ovulatory disorders, tubal damage and endometriosis account for most cases — and nearly all causes have effective treatments once identified.
Overview
Female infertility is defined as failure to conceive after 12 months of regular unprotected intercourse, or 6 months for women over 35, and those thresholds matter because they trigger the workup. The causes distribute fairly evenly across a few categories. Ovulatory disorders, led by polycystic ovary syndrome, account for around a quarter and are the most treatable. Tubal damage from previous infection, particularly chlamydia, blocks the meeting of egg and sperm. Endometriosis impairs fertility through inflammation and anatomical distortion. Diminished ovarian reserve reflects age-related decline in egg quantity and quality, which accelerates after 35 and steepens after 38. A substantial minority is unexplained after full testing. The workup is systematic: confirmation of ovulation, assessment of ovarian reserve, tubal imaging and semen analysis, since male factors contribute to around half of all infertility. Treatments target the identified cause — ovulation induction for PCOS, surgery for endometriosis or tubal disease, and IVF where simpler measures fail. Age is the strongest prognostic factor, which is why delaying evaluation costs more than any test does.
Common Symptoms
- •Inability to conceive despite 12 months of trying, or 6 months over 35
- •Irregular, infrequent or absent periods suggesting ovulatory problems
- •Painful periods, pain with intercourse or chronic pelvic pain suggesting endometriosis
- •Previous pelvic infection, appendicitis or pelvic surgery raising tubal concern
- •Age over 35 as a risk factor in itself
- •Often no symptoms at all beyond difficulty conceiving
Common Causes
- •Polycystic ovary syndrome and other ovulatory disorders
- •Tubal damage from chlamydia, other infections or previous surgery
- •Endometriosis
- •Age-related decline in ovarian reserve and egg quality
- •Thyroid dysfunction and hyperprolactinaemia disrupting ovulation
- •Premature ovarian insufficiency
- •Uterine fibroids and polyps affecting implantation
- •Unexplained infertility after full evaluation
- •Male factor, contributing to around half of couples and always worth testing in parallel
Root Causes
Ovulatory dysfunction, most commonly PCOS, disrupts the hormonal sequence that releases an egg. Tubal occlusion from pelvic infection prevents fertilisation physically. Endometriosis creates an inflammatory pelvic environment hostile to egg quality, fertilisation and implantation. Ovarian ageing reduces both egg number and the proportion of chromosomally normal eggs, driving both infertility and miscarriage risk with advancing age.
How It's Diagnosed
Diagnostic Markers
- Ovulation confirmation: mid-luteal progesterone or urinary LH tracking
- AMH and antral follicle count for ovarian reserve
- Day 2-4 FSH, LH and oestradiol for ovarian function
- Thyroid function and prolactin
- Hysterosalpingography or HyCoSy for tubal patency
- Transvaginal ultrasound for fibroids, polyps and endometriomas
- Semen analysis early — cheap, non-invasive and frequently abnormal
- Laparoscopy where endometriosis is strongly suspected
When to See a Doctor
Seek fertility evaluation after 12 months of trying, or after 6 months if you are 35 or older. Do not wait at all if your periods are absent or very irregular, if you have known endometriosis, previous pelvic infection or pelvic surgery, or if your partner has known testicular issues — these justify immediate referral. Early evaluation matters because ovarian reserve declines measurably with each year of delay.
Supplements Studied For This
Diet & Lifestyle
Suggested Pattern
Diet influences fertility most through ovulatory function. The Nurses Health Study data showed that ovulatory infertility risk fell with a pattern of slow carbohydrates, more plant protein and monounsaturated fat, full-fat dairy, and adequate iron and folate from foods and supplements. Trans fats and high-glycaemic diets tracked the opposite direction. Folate is the one non-negotiable: 400 mcg daily from before conception through early pregnancy prevents neural tube defects, and every woman trying to conceive should already be taking it. In PCOS, weight loss of 5-10% where overweight restores ovulation more reliably than any supplement.
Eat more
- Folate-rich foods: leafy greens, legumes and fortified grains, plus a 400 mcg folic acid supplement
- Slow-release carbohydrates: whole grains and legumes over refined starches
- Oily fish for omega-3, associated with better egg quality markers
- Full-fat dairy in moderation, associated with lower ovulatory infertility in cohort data
- Iron-rich foods to build preconception stores
Avoid
- Trans fats, strongly associated with ovulatory infertility
- Alcohol — none is the safest target while trying and in pregnancy
- High-mercury fish such as shark, swordfish and marlin
- Excess caffeine above roughly 200 mg daily
- Smoking and vaping, which accelerate ovarian ageing measurably
Supporting Research
The Role of Nutrient Supplements in Female Infertility: An Umbrella Review and Hierarchical Evidence Synthesis
Vitex agnus-castus extracts for female reproductive disorders: a systematic review of clinical trials
Antioxidants for female subfertility
Clinical evidence of coenzyme Q10 pretreatment for women with diminished ovarian reserve undergoing IVF/ICSI: a systematic review and meta-analysis
Inositol for Polycystic Ovary Syndrome: A Systematic Review and Meta-analysis to Inform the 2023 Update of the International Evidence-Based PCOS Guidelines
Frequently Asked Questions
Who It Affects
Infertility affects roughly 1 in 7 couples; female factors contribute to about a third, male factors a third, and combined or unexplained causes the remainder.
Fertility begins a measurable decline around age 32, accelerates after 35 and falls steeply after 38, driven by egg quality rather than egg release. PCOS affects around 1 in 10 women and is the leading ovulatory cause. Endometriosis affects roughly 10% of women overall but up to half of those with infertility.
Lifestyle Tips
- •Start 400 mcg folic acid daily now — it should already be in place before conception
- •Track ovulation with LH strips or basal temperature to time intercourse and confirm ovulation
- •Aim for intercourse every 2-3 days across the cycle rather than exhausting timing strategies
- •If overweight with PCOS, 5-10% weight loss restores ovulation in a substantial proportion
- •Stop smoking — it ages the ovaries by years and reduces IVF success
- •Keep caffeine under 200 mg daily and alcohol at zero while trying
- •Do not delay evaluation past the 6 or 12 month thresholds — age is the factor you cannot buy back
- •Test the male partner early; a semen analysis is cheap and answers a third of the question
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This information is for educational purposes only. Always consult a healthcare professional before starting any supplement regimen.