Most causes of female infertility are influenced by factors you can actively manage, from lifestyle habits to timely medical care. Ovulatory problems account for 25% to 40% of all cases, tubal damage causes another 20% to 35%, and conditions like endometriosis and uterine abnormalities make up an additional share. While not every cause is preventable, understanding the major risk factors puts you in a stronger position to protect your reproductive health early.
Protect Against Infections That Damage Fallopian Tubes
Tubal factor infertility, where the fallopian tubes become blocked or scarred, is one of the most preventable forms. It’s most commonly caused by pelvic inflammatory disease (PID), an infection of the reproductive organs that often starts with sexually transmitted infections like chlamydia or gonorrhea. PID triggers inflammation that can create adhesions around the tubes, partially or fully blocking them. Women with a history of PID are significantly more likely to have occluded fallopian tubes and adhesions visible on imaging.
The most effective prevention here is straightforward: use barrier protection during sex and get regular STI screenings, especially for chlamydia, which frequently causes no symptoms at all. If you do receive a positive STI result, completing the full course of treatment quickly is critical. Recurrent infections compound the damage, so preventing a second or third episode of PID matters just as much as preventing the first.
Keep Your Weight in a Healthy Range
Body weight has a direct, measurable effect on your ability to conceive. Women with a BMI of 25 or higher are 22% less likely to achieve a clinical pregnancy compared to women in the healthy range of 18.5 to 24.9. At a BMI of 30 or above, that likelihood drops by nearly 40%. Higher BMI is also associated with fewer mature eggs available during fertility treatment and a longer time to pregnancy overall, with a 32% increased chance of taking more than 12 months to conceive.
Being significantly underweight carries risks too. Very low body fat can disrupt the hormonal signals that trigger ovulation, leading to irregular or absent periods. The goal isn’t a specific number on the scale but maintaining a weight where your menstrual cycle functions normally. If your periods are irregular, unpredictable, or absent, that’s worth investigating regardless of what the scale says.
Stop Smoking
Cigarette smoke reduces a woman’s ovarian reserve by roughly 20%. That means a smoker has fewer eggs available at any given age than a nonsmoker. Smoking also accelerates the timeline to menopause by about one year on average, and for every additional cigarette smoked per day, the age of menopause shifts earlier by about 2.5 weeks. Over years of moderate to heavy smoking, that adds up to a meaningfully shorter window of fertility. Quitting at any point slows the damage, but the earlier you stop, the more of your egg supply you preserve.
Reduce Exposure to Hormone-Disrupting Chemicals
Certain synthetic chemicals interfere with the hormonal system that controls ovulation and egg development. Two of the most well-studied are bisphenol A (BPA) and phthalates, both found in everyday products.
BPA is common in polycarbonate plastics, the lining of canned foods, thermal receipt paper, and some plastic bottles. It disrupts the hormonal chain that regulates your reproductive cycle, and elevated BPA levels have been detected at higher concentrations in women with PCOS compared to women without the condition. You absorb BPA through food, skin contact, and even inhalation. Practical steps to reduce exposure include avoiding microwaving food in plastic containers, choosing BPA-free cans or glass containers, and minimizing handling of thermal paper receipts.
Phthalates are used to soften plastics and show up in PVC products, food packaging, some cosmetics, and fragranced personal care products. They leach out of products easily because they aren’t chemically bonded to the plastic. In the body, phthalates can disrupt the growth pattern of ovarian follicles, increase oxidative stress, and cause follicle death. Choosing fragrance-free products, storing food in glass rather than plastic, and checking labels for phthalate-free options all help reduce your daily dose.
Eat for Ovulatory Health
Dietary patterns have a surprisingly strong connection to ovulatory function. A Mediterranean-style diet, rich in vegetables, whole grains, fish, and healthy fats, has been linked to a 40% increase in pregnancy rates in one study of women undergoing fertility treatment. The benefits come from several overlapping mechanisms: anti-inflammatory fats, antioxidants, and better folate and B-vitamin levels in both the blood and the fluid surrounding developing eggs.
Some specific findings stand out. Women who replaced just 5% of their animal protein intake with plant-based protein had a 50% lower risk of ovulatory infertility. Those in the highest category of whole grain consumption (more than about 52 grams per day) had a 53% live birth rate compared to 35% in the lowest intake group. And women who ate fruit fewer than three times per month had a 29% higher risk of infertility compared to those who consumed fruit multiple times daily.
Omega-3 fatty acids from fish like salmon, sardines, and mackerel have been associated with better embryo quality during fertility treatment. Antioxidants found in tomatoes, berries, and colorful vegetables help protect eggs from oxidative damage. You don’t need a rigid meal plan. The pattern matters more than any single food: prioritize plants, whole grains, and fish while limiting processed foods and refined carbohydrates.
Get Early Diagnosis for PCOS and Endometriosis
Polycystic ovary syndrome is responsible for roughly 70% of ovulation-related infertility. It’s also one of the most manageable conditions when caught early. Symptoms like irregular periods, acne, excess hair growth, or difficulty losing weight in your teens or twenties are worth bringing up with a healthcare provider. Early identification allows for interventions that regulate your cycle and protect the uterine lining, which reduces long-term complications and preserves your fertility options.
Endometriosis, where tissue similar to the uterine lining grows outside the uterus, accounts for 10% to 15% of infertility cases. It causes inflammation and adhesions that can affect the ovaries and fallopian tubes. Symptoms often include painful periods, pain during sex, and chronic pelvic pain. Many women wait years before receiving a diagnosis, and during that time the disease can progress. If you have persistent pelvic pain or increasingly painful cycles, pushing for evaluation sooner rather than later gives you more options down the road.
Understand How Age Affects Your Timeline
Age is the single most powerful factor in female fertility, and it’s the one you can’t reverse. A woman in her early to mid-20s has a 25% to 30% chance of conceiving in any given month. By 40, that drops to around 5%. The decline isn’t sudden. It’s gradual through the early 30s, steepens after 35, and accelerates sharply after 37 as both egg quantity and egg quality decrease.
This doesn’t mean you need to have children by a certain age. It means that if you know you want biological children eventually, factoring age into your planning helps you make informed decisions. An AMH (anti-Müllerian hormone) blood test can estimate how many eggs you have remaining relative to your age. It won’t tell you whether those eggs are healthy or predict whether you’ll conceive, but it gives you a snapshot of your ovarian reserve. If your levels are lower than expected for your age, that’s useful information for deciding next steps.
Egg Freezing as a Backup Plan
For women who want to preserve their options, egg freezing (oocyte cryopreservation) is most effective when done younger. A large 15-year follow-up study found that women who froze eggs before age 38 had a 51% live birth rate when they later used those eggs. For women who froze eggs between 38 and 40, the rate dropped to 34%. After 41, it fell to 23%. A separate analysis found nearly identical numbers: 52% for women 35 and under, 34% for ages 36 to 39, and 19% for those over 40.
Egg freezing isn’t a guarantee, and the process involves hormone injections and a minor retrieval procedure. But if your life circumstances don’t align with your biological timeline, freezing eggs in your early to mid-30s gives you the best statistical chance of a successful pregnancy later. The gap between freezing at 34 versus 39 is substantial enough to be worth considering seriously if this option is on your radar.