Oligospermia

oligozoospermialow sperm countdiminishedfew sperm with poor motilityimpaired spermatogenesisoligospermicOligozoo'''spermiaoligozoospemia
Terms oligospermia, oligozoospermia, and low sperm count refer to semen with a low concentration of sperm and is a common finding in male infertility.wikipedia
105 Related Articles

Male infertility

infertileMale factor infertilitysterile
Terms oligospermia, oligozoospermia, and low sperm count refer to semen with a low concentration of sperm and is a common finding in male infertility.
Men with this condition can exhibit azoospermia (no sperm production), oligospermia (small number of sperm production), or they will produce abnormally shaped sperm.

Semen analysis

sperm countsemen sampleLeuco'''spermia
The diagnosis of oligozoospermia is based on one low count in a semen analysis performed on two occasions.
A lower sperm count is considered oligozoospermia.

Y chromosome microdeletion

Y-micro-deletion
Y chromosome microdeletions
Men with reduced sperm production (in up to 20% of men with reduced sperm count, some form of YCM has been detected ) varies from oligozoospermia, significant lack of sperm, or azoospermia, complete lack of sperm.

Ejaculatory duct obstruction

obstruction of the ejaculatory duct
Ejaculatory duct obstruction
In case of proven fertility but unresolved pelvic pain, even one or both partially obstructed ejaculatory ducts may be the origin of pelvic pain and oligospermia.

Cystic fibrosis

CFCystic fibrosis of the pancreasdisease
Lack of Vas deferens, often related to genetic markers for cystic fibrosis
The main cause of infertility in men with CF is congenital absence of the vas deferens (which normally connects the testes to the ejaculatory ducts of the penis), but potentially also by other mechanisms such as causing no sperm, abnormally shaped sperm, and few sperm with poor motility.

Ejaculation

ejaculateejaculatedejaculates
Post-testicular factors decrease male fertility due to conditions that affect the male genital system after testicular sperm production and include defects of the genital tract as well as problems in ejaculation:
An unusually low sperm count, not the same as low semen volume, is known as oligospermia, and the absence of any sperm from the semen is termed azoospermia.

Overweight

excess body weightexcess weightheavy-set
A review in 2013 came to the result that oligospermia and azoospermia are significantly associated with being overweight (odds ratio 1.1), obese (odds ratio 1.3) and morbidly obese (odds ratio 2.0), but the cause of this is unknown.
Being overweight also increases the risk of oligospermia and azoospermia in men.

Semen quality

sperm qualityqualitysperm viability
semen quality
This intercourse advantage is even greater for men with oligospermia.

Semen

seminal fluidseminalsperm
Terms oligospermia, oligozoospermia, and low sperm count refer to semen with a low concentration of sperm and is a common finding in male infertility.

Sperm

sperm cellspermatiasperm cells
Terms oligospermia, oligozoospermia, and low sperm count refer to semen with a low concentration of sperm and is a common finding in male infertility.

World Health Organization

WHOWorld Health OrganisationWorld Health Organization (WHO)
For many decades sperm concentrations of less than 20 million sperm/ml were considered low or oligospermic, recently, however, the WHO reassessed sperm criteria and established a lower reference point, less than 15 million sperm/ml, consistent with the 5th percentile for fertile men.

Hypogonadism

low testosterone levelslow sex hormone levelslow testosterone levels in men
Hypogonadism due to various causes

Alcohol

alcoholssecondary alcoholtertiary alcohol
Drugs, alcohol, smoking

Smoking

smokersmokesmokers
Drugs, alcohol, smoking

Cycling

cyclistcyclistsbiking
Strenuous riding (bicycle riding, horseback riding)

Equestrianism

equestrianhorseback ridinghorse riding
Strenuous riding (bicycle riding, horseback riding)

Medication

pharmaceuticalpharmaceuticalsdrug
Medications, including androgens.

Androgen

androgensandrogenicmale hormones
Medications, including androgens.

Mast cell

mast cellsanaphylactic degranulationmastocytes
Mast cells releasing inflammatory mediators appear to directly suppress sperm motility in a potentially reversible manner, and may be a common pathophysiological mechanism for several of the above-mentioned factors.

Sperm motility

motilityare the most motilemotile
Mast cells releasing inflammatory mediators appear to directly suppress sperm motility in a potentially reversible manner, and may be a common pathophysiological mechanism for several of the above-mentioned factors.

Y chromosome

Y-chromosomeYY-DNA
Genetic defects on the Y chromosome