Sperm, originating in the testes, resemble tadpoles with a large head measuring approximately 4.6 micrometers in length, 2.6 micrometers in width, and 1.5 micrometers in thickness. The neck and body combined are equal in length to the head, while the tail extends up to 40 micrometers, resulting in a total sperm length of about 60 micrometers.Sperm exhibit strong motility, propelled by rhythmic tail movements that enable forward progression at a speed of approximately 50–60 micrometers per second.
Physiologically, a normal semen sample should contain 40 to 120 million sperm per milliliter. A count below 20 million per milliliter significantly impairs fertility. Moreover, sperm quality is declining, with increased rates of abnormalities and poor-quality sperm. Sperm motility, penetration capacity, and fertilization rates are decreasing, leading to a gradual rise in male infertility rates.Dr. Catalai of the New York Body Research Foundation further notes that while only 8% of men sought consultation for infertility in 1960, this figure now exceeds 40%.
Obesity
In recent years, obesity rates have risen annually, becoming a societal issue affecting both physical and mental health.Initially, obese individuals may not experience noticeable symptoms, but obesity harbors multiple hidden risks. Particularly in men, obesity can impair the development of reproductive organs such as the testes and penis. The underlying mechanism involves adipose tissue converting testosterone into estrogen, reducing male hormones and increasing estrogen levels in the body. This disrupts sperm production and compromises sperm quality.Obesity can also trigger hypertension and diabetes, conditions that may lead to physiological dysfunction. Smoking and Alcohol Abuse Studies reveal that men who smoke over 31 cigarettes daily or have smoked for more than 10 years experience significant declines in sperm count and motility, with abnormal sperm rates increasing exponentially.Alcohol is a gonadotoxin. Excessive drinking can poison the gonads, causing testicular damage, testicular atrophy, weakened reproductive function, decreased blood testosterone levels, and resulting in sperm damage, abnormalities, reduction, underdevelopment, and reduced motility. It can also induce erectile dysfunction and anejaculation.
Environmental Pollution
Our surroundings—air, water, and soil—contain numerous chemicals that impact human reproduction. Harmful metals like lead, mercury, and cadmium, along with diverse pesticides and certain medications, all pose threats to sperm.Experts indicate that male sperm reduction is primarily caused by chemicals produced from environmental factors. These substances can lead to degeneration and atrophy of the male reproductive system, abnormal mating behavior, and disruption of hormone receptor function. This, in turn, affects the development of the embryonic reproductive system, resulting in feminization of male embryos, smaller testes, and further reduced sperm count.Methods to Prevent Male Infertility
Traditional Chinese beliefs consider infertility a grave dishonor to ancestors. Though attitudes have shifted, infertility remains a heavy psychological burden for men. While causes are complex, certain forms of male infertility can be entirely prevented or avoided through consistent healthy habits:
◎ Get vaccinated on schedule and maintain good personal hygiene to prevent infectious diseases that harm male fertility, such as mumps and sexually transmitted infections. ◎ Acquire basic sexual health knowledge, understand male physiology and wellness practices. If you notice unusual changes in your testicles—such as swelling, hardening, lumps, or pain—seek prompt medical attention.◎ If you frequently handle radioactive materials, high temperatures, or toxic substances, strictly adhere to operational protocols and protective guidelines. Never be careless. If you plan to conceive soon, it's best to avoid such work for at least six months before trying to conceive.
◎ Testicles are highly sensitive organs that function optimally at temperatures approximately 1°C lower than body temperature. Elevated temperatures impair sperm production. Avoid activities that raise scrotal temperature, such as prolonged bicycle riding, hot baths, or wearing tight jeans.
◎ Modify unhealthy habits: quit smoking and drinking. Avoid excessively greasy foods, as they can diminish libido. Additionally, minimize exposure to household toxins—for instance, let dry-cleaned garments air out for several days before wearing, as dry-cleaning solvents may impair male sexual function.◎ Prioritize premarital health screenings to detect abnormalities early and prevent marital distress. After marriage, regularly discuss sexual issues with your spouse, fostering mutual understanding and cooperation to avoid psychological causes of erectile dysfunction or premature ejaculation. Five Classes of Drugs Causing Male Infertility Common medications affecting male fertility include the following five categories: 1. Hormonal Drugs.
The use of estrogen, progesterone, and testosterone propionate can suppress pituitary gonadotropin secretion, thereby inhibiting testicular spermatogenesis.
2. Drugs that directly inhibit sperm production.
Examples include dichlorodiamidine, an insecticide that also suppresses spermatogenesis;Other agents like dinitropyridines, nitrofuran derivatives, anticancer alkylating agents, and the recently studied gossypol extracted from cottonseed all powerfully suppress testicular spermatogenesis.
III. Drugs affecting sperm maturation.
Compounds like the antiandrogen medroxyprogesterone acetate and chlorinated glycerol derivatives, while having minimal impact on testicular spermatogenesis, directly affect mature sperm produced by the testes. They prevent sperm from reaching maturity and thus lose their fertilization capacity.
IV. Drugs affecting ejaculation.
Hypertension medications like guanethidine and methyldopa may reduce ejaculate volume or even cause anejaculation. Certain drugs inhibit the ejaculatory reflex, delaying ejaculation—examples include diazepam and chlorpromazine.
V. Many topical medications
Substances like surfactants, organometallic compounds (e.g., mercury acetate), and weak acids possess direct spermicidal effects.
Frequent use of such topical treatments for female reproductive tract conditions—such as vaginal suppositories—inevitably impacts fertility.