

Recognising the early signs of infertility enables you to work on factors that influence fertility, helps you adjust your mindset and expectations, and prepares you for the possibility of fertility treatment.
The most definitive sign is trouble conceiving after one year (or after six months if you’re 35 or older). Therefore, couples under the age of 36 are advised to see a medical specialist if they have been trying to get pregnant for a year. Those over 36 should seek medical assistance if they are not pregnant after 6 months. As such, if you feel like you are struggling to conceive and you are not pregnant after 4-6 months of trying, it is not necessarily uncommon.
The only indicator of infertility is struggling to conceive and not being able to get pregnant. However, certain symptoms suggest infertility and may prompt you to visit a healthcare professional. These signs are different for males and females.
The early signs of infertility in women include:
It is important to note that experiencing one or more of these symptoms does not mean you are infertile. For instance, irregular periods can be caused by stress. However, they may be indicative of conditions associated with fertility, such as endometriosis or polycystic ovary syndrome (PCOS).
The early signs of infertility in men include:
If low testosterone levels are the cause of infertility, you may experience:
As with women, these symptoms are not necessarily indicative of infertility but can suggest it. Male infertility is often symptomless and can only be detected with a medical assessment, in which healthcare professionals will test for things like sperm motility and testosterone levels.
Several factors impact an individual’s fertility. Some are variables you can influence to potentially improve the chances of pregnancy. Others you have no influence over.
Fertility generally decreases with age, making it harder to conceive the older you are. For women, the decline is fairly gentle until you reach 35, after which it declines more quickly.
This is demonstrated by figures from the American Society for Reproductive Medicine.
At first glance, the numbers might seem discouraging, but the likelihood improves overall when time is taken into account. Looking at conception rates over 6 or 12 months of actively trying provides a more complete perspective. For instance, one study examining natural pregnancy rates across different age groups reported the following chances.
There is significantly less research on male fertility by age. While many believe men’s biological clocks aren’t as pronounced as women’s, research shows that male fertility decreases with age.
For instance, the ALSPAC Study Team demonstrated that conception is 30% less likely for men over 40 than it is for men younger than 30. In both men and women, fertility after 40 starts to decrease more substantially.
Alcohol has a negative effect on fertility for both men and women. It affects sperm production, ovulation and hormones, and lowers sperm and egg quality.
Because of the way alcohol affects sperm when trying to get pregnant, aspiring parents are recommended to abstain entirely. Even moderate amounts of alcohol impact fertility, but sperm quality improves rapidly after a short period of abstinence.
FDA data shows that smoking affects fertility by reducing the likelihood of conceiving. In women, it negatively impacts hormone production. In men, it can damage sperm DNA.
As with alcohol, aspiring parents are recommended to reduce tobacco use as much as possible and abstain entirely if possible.
Research into the effects of marijuana on fertility is not as extensive as that on tobacco and alcohol use. However, studies show that smoking marijuana will negatively impact fertility in both men and women. The effects of ingested or vaporised marijuana are less well known, but there are suggestions that THC, the psychoactive compound in cannabis, may affect fertility (Nature).
With this in mind, aspiring parents should seek professional medical advice on marijuana use. Abstinence is the safe option
Research shows there is a connection between BMI and fertility, and weight influences the likelihood of conception. NHS guidance suggests a healthy BMI ranges from 19 to 25. People with a BMI outside this range may find it harder to conceive (NHS).
For underweight women, a low BMI may result in irregular menstrual cycles or no period at all. The same is true for overweight women with high BMIs. However, obesity can impact fertility even when periods are regular.
A lack of exercise contributes to infertility in both men and women by promoting weight gain and affecting hormone production. Even light exercise can lead to improvements in male and female fertility, increasing the chances of successful conception. At the same time, researchers have found that vigorous exercise can impact fertility in women (Human Reproduction). Consequently, regular moderate exercise is recommended.
Untreated STIs can affect fertility in aspiring parents. Bacterial STIs, such as chlamydia and gonorrhea, are particularly concerning for women as they can cause pelvic inflammatory disease (PID). PID is an infection of the reproductive organs that can result in scarring that impacts fertility. In men, untreated STIs can inflame and scar the genital tract and epididymis, the coiled tube that carries sperm from the testicles. These can create problems with ejaculation and contribute to infertility.
Stress has long been associated with infertility, but scientists have found it difficult to demonstrate an empirical connection. In recent years, studies measuring stress biomarkers, such as hair cortisol levels, suggest that high stress levels do negatively affect fertility in women. More generally, stress can result in a lower sex drive, which may impact attempts to conceive.
Healthcare specialists suggest that under-35s go to a medical professional for a fertility check after 12 months of regular unprotected sex. If you are over 35, you should have a fertility check after six months of regular unprotected sex.
However, you can also see specialists for fertility testing before trying to get pregnant. This may be particularly appealing to aspiring parents over the age of 35 who want to move quickly.
To increase the chances of pregnancy, experts recommended having sex every 1–2 days during your fertile window (the five days leading up to ovulation and the day of ovulation itself). You can track your ovulation cycle with apps or ovulation test kits, making it easier to identify your most fertile days. You should also maintain a healthy weight, avoid smoking, alcohol consumption and caffeine.
If you are wondering why you are still not pregnant even though you had sex during fertile days, it might be the result of one of the listed risk factors such as alcohol, smoking or a lack of exercise. Therefore, the first step is to assess whether you're following the guidance and whether there are actions you can take to improve the likelihood of pregnancy. For instance:
In the case of infertility, healthcare providers may offer one of three principal treatments:
Men can also adopt positive lifestyle changes to improve fertility and sperm quality:
In the case of infertility, healthcare providers may offer one of three principal treatments:
Infertility statistics show that approximately one in six people will experience infertility at some point in their lives (source). For couples, one in seven will have fertility difficulties and struggle to conceive.
In cases of infertility, the cause can be traced to the female partner in around 30-40% of cases and to the male partner in approximately 10-30% of cases. Instances where causes can be traced to both partners account for 15-30% of cases.
Couples who have been attempting to conceive for over three years have a one in four chance of conceiving without fertility treatment within a year.
If you are considering or using fertility treatment to conceive, learn more about IVF success rates and IUI success rates.
People respond to infertility in different ways. Stress, anger, jealousy and anxiety are normal responses and we should allow ourselves to make space for all these emotions. Some find it beneficial to focus on the elements you can control, such as lifestyle factors, and can feel empowered by learning more about the condition or potential fertility treatments.
We have a dedicated guide for coping with infertility if you would like to learn more.
Medical professionals use a range of tests to check for infertility in women:
Medical professionals check for infertility in men using the following diagnostic tools:
Ovulation happens one day per menstrual cycle, and you can fall pregnant up to five days before that date and 24 hours after. This is because sperm can survive in the body for a maximum of five days, and eggs survive up to a day after ovulation. This gives you a six-day fertility window in which you can conceive. Outside of this window, you cannot get pregnant.
Infertility is a medical condition that means couples cannot conceive a child despite having regular unprotected sex.
There are two main types of infertility:
The term subfertility is used to refer to instances where there is a delay in pregnancy despite regular unprotected sex. Subfertile couples may still conceive naturally, but it often takes longer to do so. Generally, subfertility is used when individuals have been trying to conceive unsuccessfully for less than 12 months. Infertility is used when individuals have been trying unsuccessfully for over 12 months.
The two terms are often used interchangeably, though this is technically incorrect. Some people prefer subfertile because, unlike infertile, it suggests natural conception is possible.
Some couples or individuals also face unexplained infertility (idiopathic infertility). Unexplained infertility is diagnosed when the couple or individual have undergone all appropriate fertility tests and no cause of infertility has been found during those tests.
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