Low Sperm Count: Signs, Causes and Treatment

Few reports cause a man more worry than a semen analysis marked “low sperm count.” Many men feel it as a judgement on their manhood, and some delay seeing a doctor for exactly that reason. The reality is far more hopeful: a low sperm count is a common, measurable and often treatable cause of delayed pregnancy, and many couples go on to have a baby. This guide explains what counts as low, the signs, the common causes, how it is diagnosed, and the treatment options.

What Is a Low Sperm Count?

The Definition

A low sperm count, medically called oligozoospermia (or oligospermia), means fewer sperm in the semen than the usual range. The World Health Organization’s lower reference limit is about 16 million sperm per millilitre, or about 39 million in the whole sample. It is measured by a semen analysis. A value below the limit is a reason to look further, not a diagnosis of infertility.

Count is only one of several measurements. Movement (motility) and shape (morphology) matter too, and low values in all three together are called oligoasthenoteratozoospermia, or OAT. A count of zero is called azoospermia, which is a separate topic.

Signs of a Low Sperm Count

Most men with a low sperm count have no signs at all. They feel completely well, have a normal sex life, and learn about the problem only when a semen analysis is done after a delay in conceiving. That is why testing, rather than symptoms, is the only reliable way to know. Clues that should prompt a check include:

• Difficulty conceiving after a year of regular unprotected sex, or six months if your partner is 35 or older.
• Pain, swelling or a lump in the testicle area, or a feeling of heaviness in the scrotum.
• Small or firm testicles.
• Reduced sexual desire or erection problems, which can point to a hormonal cause.
• Less facial or body hair, or other signs of a hormonal imbalance.
• A history of undescended testes, mumps affecting the testicles, or testicular injury or surgery.

Common Causes of Low Sperm Count

In many men, a clear cause is found. In others, none is, which doctors call idiopathic. The most common causes include:

• Varicocele, — enlarged veins in the scrotum, one of the most common and most treatable causes.
• Infections, — including genital and urinary tract infections.
• Hormonal problems, — such as low testosterone, or disorders of the pituitary gland or thyroid.
• Genetic conditions, — such as Klinefelter syndrome or missing sections of the Y chromosome.
• Past testicular problems, — including undescended testes, torsion, injury or surgery.
• Medicines and treatments, — including anabolic steroids and testosterone supplements, which can switch off sperm production, and chemotherapy or radiation.
• Lifestyle factors, — such as smoking, heavy alcohol, drug use, obesity, poor sleep and chronic stress.
• Heat and environmental exposure, — including prolonged heat and some workplace chemicals.
• Ejaculation problems, — such as sperm going backwards into the bladder.
• Recent illness or fever, — which can temporarily lower sperm production.

How Is It Diagnosed?

• A repeat semen analysis — Because results vary between samples, one low result is usually confirmed with a second test.
• History and examination — Your doctor asks about illness, medicines, surgery, lifestyle and sexual function, and examines the testicles.
• Hormone blood tests — These look for hormonal causes, particularly when the count is very low.
• A scrotal ultrasound — This can show a varicocele or other structural problems.
• Further tests when needed — Genetic tests for very low counts, a urine test for retrograde ejaculation, or a sperm DNA fragmentation test in selected cases.

Treatment Options

Treatment depends on the cause and on how low the count is. The main approaches are:

• Treating the cause. — This may mean treating an infection, or repairing a varicocele where appropriate.
• Lifestyle changes. — Stopping smoking, cutting back on alcohol, reaching a healthier weight, sleeping well and avoiding heat.
• Reviewing medicines. — If you take steroids or testosterone, do not stop or change anything without your doctor, but do tell them.
• Hormonal treatment — when a hormonal cause is found.
• IUI for mildly low counts, where the prepared sperm is placed in the uterus.
• Surgical sperm retrieval when no sperm are found in the semen.

Can a Low Sperm Count Be Improved?

Sometimes, yes. If the cause is something treatable or reversible, such as an infection, a varicocele, smoking or heavy drinking, the count can improve. Because sperm take about three months to develop, any improvement from a change usually shows only after that time.

Worth knowing:

Be wary of tablets, powders and “sperm booster” adverts. Evidence for most is weak, and some products can do harm. See whether sperm count supplements actually work and at-home male fertility test kits before spending money.

Can You Father a Child With a Low Sperm Count?

Very often, yes. A low count lowers the chance of natural conception and may make it take longer, but pregnancy is still possible, and with treatment such as ICSI, even very low counts can lead to a pregnancy.

When to See a Doctor

• Your semen analysis shows a low count or other abnormalities.
• You have been trying for a year without success, or six months if your partner is 35 or older.
• You have pain, swelling or a lump in the testicles.
• You have a history of undescended testes, mumps, testicular surgery or injury.
• You use, or have used, anabolic steroids or testosterone.

Common Myths About Low Sperm Count

A low sperm count is a finding, not a failing. Understood and treated early, it opens more options than most couples expect.

Frequently Asked Questions