Factors affecting Infertility, the causes, and prevention. 

It can be caused by a number of different factors, in either the male or female reproductive systems. However, it is sometimes not possible to explain the causes of infertility.

Causes of male infertility
    •    Abnormal sperm production or function: due to undescended testicles, genetic defects, health problems such as diabetes, or infections such as chlamydia, gonorrhea, mumps or HIV. Enlarged veins in the testes (varicocele) also can affect the quality of sperm.
    •    Problems with the delivery of sperm: due to sexual problems, such as premature ejaculation; certain genetic diseases, such as cystic fibrosis; structural problems, such as a blockage in the testicle; or damage or injury to the reproductive organs.
    •    Overexposure to certain environmental factors: such as pesticides and other chemicals, and radiation. Cigarette smoking, alcohol, marijuana, anabolic steroids, and taking medications to treat bacterial infections, high blood pressure and depression also can affect fertility. Frequent exposure to heat, such as in saunas or hot tubs, can raise body temperature and may affect sperm production.
    •    Damage related to cancer and its treatment: including radiation or chemotherapy. Treatment for cancer can impair sperm production, sometimes severely.

Causes of female infertility
    •    Ovulation disorders: which affect the release of eggs from the ovaries. These include hormonal disorders such as polycystic ovary syndrome. Hyperprolactinemia, a condition in which you have too much prolactin — the hormone that stimulates breast milk production — also may interfere with ovulation. Either too much thyroid hormone (hyperthyroidism) or too little (hypothyroidism) can affect the menstrual cycle or cause infertility. Other underlying causes may include too much exercise, eating disorders or tumors.
    •    Uterine or cervical abnormalities: including abnormalities with the cervix, polyps in the uterus or the shape of the uterus. Noncancerous (benign) tumors in the uterine wall (uterine fibroids) may cause infertility by blocking the fallopian tubes or stopping a fertilized egg from implanting in the uterus.
    •    Fallopian tube damage or blockage: often caused by inflammation of the fallopian tube (salpingitis). This can result from pelvic inflammatory disease, which is usually caused by a sexually transmitted infection, endometriosis or adhesions.
    •    Endometriosis: which occurs when endometrial tissue grows outside of the uterus, may affect the function of the ovaries, uterus and fallopian tubes.
    •    Primary ovarian insufficiency (early menopause): when the ovaries stop working and menstruation ends before age 40. Although the cause is often unknown, certain factors are associated with early menopause, including immune system diseases, certain genetic conditions such as Turner syndrome or carriers of Fragile X syndrome, and radiation or chemotherapy treatment.
    •    Pelvic adhesions:- bands of scar tissue that bind organs that can form after pelvic infection, appendicitis, endometriosis or abdominal or pelvic surgery.
    •    Cancer and its treatment: Certain cancers — particularly reproductive cancers — often impair female fertility. Both radiation and chemotherapy may affect fertility.
 
Risk factors
Many of the risk factors for both male and female infertility are the same. They include:
    1.    Age
Women’s fertility gradually declines with age, especially in the mid-30s, and it drops rapidly after age 37. Infertility in older women is likely due to the lower number and quality of eggs, and can also be due to health problems that affect fertility. Men over age 40 may be less fertile than younger men.

    2.    Tobacco use. 
Smoking tobacco or marijuana by either partner may reduce the likelihood of pregnancy. Smoking also reduces the possible effectiveness of fertility treatment. Miscarriages are more frequent in women who smoke. Smoking can increase the risk of erectile dysfunction and a low sperm count in men.

    3.    Alcohol use. 
For women, there’s no safe level of alcohol use during conception or pregnancy. Alcohol use may contribute to infertility. For men, heavy alcohol use can decrease sperm count and motility.

    4.    Being overweight. 
Among American women, an inactive lifestyle and being overweight may increase the risk of infertility. For men, sperm count also may be affected by being overweight.

    5.    Being underweight. 
Women at risk of fertility problems include those with eating disorders, such as anorexia or bulimia, and those who follow a very low-calorie or restrictive diet.

    6.    Exercise issues. 
A lack of exercise contributes to obesity, which increases the risk of infertility. Less often, ovulation problems may be associated with frequent strenuous, intense exercise in women who are not overweight.

Prevention
Some types of infertility aren’t preventable. But several strategies may increase your chances of pregnancy.
➡️For Couples:
    ⁃    Have regular intercourse several times around the time of ovulation for the highest pregnancy rate. Intercourse beginning at least five days before and until a day after ovulation improves your chances of getting pregnant. Ovulation usually occurs in the middle of the cycle — halfway between menstrual periods — for most women with menstrual cycles about 28 days apart.
➡️Men
Although most types of infertility aren’t preventable in men, these strategies may help:
    ⁃    Avoid drug and tobacco use and drinking too much alcohol, which may contribute to male infertility.
    ⁃    Avoid high temperatures found in hot tubs and hot baths, as they can temporarily affect sperm production and motility.
    ⁃    Avoid exposure to industrial or environmental toxins, which can affect sperm production.
    ⁃    Limit medications that may impact fertility, both prescription and nonprescription drugs. Talk with your doctor about any medications you take regularly, but don’t stop taking prescription medications without medical advice.
    ⁃    Exercise moderately. Regular exercise may improve sperm quality and increase the chances for achieving a pregnancy.

➡️Women
For women, a number of strategies may increase the chances of becoming pregnant:
    ⁃    Quit smoking: Tobacco has many negative effects on fertility, not to mention your general health and the health of a fetus. If you smoke and are considering pregnancy, quit now.
    ⁃    Avoid alcohol and street drugs: These substances may impair your ability to conceive and have a healthy pregnancy. Don’t drink alcohol or use recreational drugs, such as marijuana, if you’re trying to get pregnant.
    ⁃    Limit caffeine: Women trying to get pregnant may want to limit caffeine intake. Ask your doctor for guidance on the safe use of caffeine.
    ⁃    Exercise moderately: Regular exercise is important, but exercising so intensely that your periods are infrequent or absent can affect fertility.
    ⁃    Avoid weight extremes: Being overweight or underweight can affect your hormone production and cause infertility.
Treatment to help a person conceive naturally will depend on many factors, including the age of the person who wishes to conceive, how long infertility has lasted, personal preferences, and their general state of health.