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What is male infertility?
A man’s fertility generally relies on the quantity and quality of his sperm. If the number of sperm a man ejaculates is low or if the sperm are of a poor quality, it will be difficult, and sometimes impossible, for him to cause a pregnancy.
Male infertility is diagnosed when, after testing both partners, reproductive problems have been found in the male.
How common is male infertility?
Infertility is a widespread problem. For about one in five infertile couples the problem lies solely in the male partner.
It is estimated that one in 20 men has some kind of fertility problem with low numbers of sperm in his ejaculate. However, only about one in every 100 men has no sperm in his ejaculate.
What are the symptoms of male infertility?
Medical tests are needed to find out if a man is infertile.
What causes male infertility?
About two-thirds of infertile men have a problem with making sperm in the testes. Either low numbers of sperm are made and/or the sperm that are made do not work properly.
Sperm transport problems are found in about one in every five infertile men, including men who have had a vasectomy but now wish to have more children. Blockages (often referred to as obstructions) in the tubes leading sperm away from the testes to the penis can cause a complete lack of sperm in the ejaculated semen.
Other less common causes of infertility include: sexual problems that affect whether semen is able to enter the woman’s vagina for fertilisation to take place (one in 100 infertile couples); low levels of hormones made in the pituitary gland that act on the testes (one in 100 infertile men); and sperm antibodies (found in one in 16 infertile men). In most men sperm antibodies will not affect the chance of a pregnancy but in some men sperm antibodies reduce fertility.
Known causes of male infertility
Sperm production problems
• Chromosomal or genetic causes
• Undescended testes (failure of the testes to descend at birth)
• Torsion (twisting of the testis in scrotum)
• Varicocele (varicose veins of the testes)
• Medicines and chemicals
• Radiation damage
• Unknown cause
Blockage of sperm transport
• Prostate-related problems
• Absence of vas deferens
Sexual problems (erection and ejaculation problems)
• Retrograde and premature ejaculation
• Failure of ejaculation
• Erectile dysfunction
• Infrequent intercourse
• Spinal cord injury
• Prostate surgery
• Damage to nerves
• Some medicines
• Pituitary tumours
• Congenital lack of LH/FSH (pituitary problem from birth)
• Anabolic (androgenic) steroid abuse
• Injury or infection in the epididymis
• Unknown cause
How is male infertility diagnosed?
If a couple has been trying for a pregnancy without success, they should go to their local doctor, family planning clinic or women’s health clinic, and have some initial tests. Both partners should be tested, even if one has a child from another relationship. Diagnosis can involve a medical history from the man and a physical examination along with a semen analysis to check the number, shape and movement of sperm in the ejaculate.
Blood tests may also be done to check the levels of hormones that control sperm production. Genetic investigations and testicular biopsies are sometimes done.
How is male infertility treated?
One in eight infertile men has a treatable condition, and after treatment, couples can become pregnant naturally.
In some cases, the doctor will recommend that the couple seek assisted reproductive technologies (ART), such as IVF (in vitro fertilisation). ART do not cure or treat the cause of infertility but they can help couples achieve a pregnancy, even if the man’s sperm count is very low.