SEXUAL HEALTH CONCERN

Low Testosterone

Also called: testosterone replacement, low t, low testosterone levels

Low testosterone occurs when the body does not produce enough testosterone for normal function. It can affect sexual health, energy, mood, muscle and bone health, although similar symptoms can also have many other causes.

TYPICALLY OCCURS

Ageing, testicular conditions, hormonal disorders and medication

TREATED BY

Testosterone replacement therapy and underlying-cause management

ALSO LINKED TO

–

Why it happens?

Testosterone is produced mainly by the testes, with its production controlled through signals between the brain, pituitary gland and testes. Low testosterone can develop when the testes are unable to produce sufficient amounts, known as primary hypogonadism, or when the hypothalamus or pituitary gland does not provide the hormonal signals needed to stimulate testosterone production, known as secondary hypogonadism. Possible causes include testicular injury or disease, certain genetic conditions, pituitary disorders and previous chemotherapy or radiotherapy.

Testosterone levels also tend to decline gradually with increasing age, but ageing alone does not necessarily mean someone has a testosterone deficiency requiring treatment. Obesity, type 2 diabetes, severe or chronic illness and some sleep disorders can be associated with lower testosterone levels. Certain medications, particularly long-term opioid medicines and some hormonal treatments, can also suppress testosterone production. In some cases, reduced testosterone may be related to a potentially reversible underlying factor rather than a permanent inability to produce the hormone.

Symptoms vary and are not specific to testosterone deficiency. Reduced sexual desire, erectile difficulties, fatigue, low mood, reduced muscle mass or strength, increased body fat and problems with concentration can occur, while prolonged significant deficiency may contribute to reduced bone density. Because these symptoms can also result from stress, poor sleep, depression, thyroid problems, medication and numerous other conditions, low testosterone cannot reliably be diagnosed from symptoms alone. Diagnosis generally requires compatible symptoms together with appropriately timed blood tests, sometimes repeated to confirm the result and followed by further investigation to determine the underlying cause.

How far along is it?

Early

Subtle changes such as reduced energy, lower sexual desire, changes in mood or reduced exercise performance may appear. These symptoms are non-specific and do not necessarily indicate testosterone deficiency.

Moderate

Symptoms become more consistent and may include ongoing low libido, erectile difficulties, fatigue, reduced muscle strength, changes in body composition or difficulty concentrating.

Advanced

Confirmed testosterone deficiency persists and may have broader effects on sexual function, muscle mass, mood and bone health. Investigation of the underlying cause and appropriate medical management become particularly important.

What addresses it?

Treatments that address this

Male hormone checkup→

Medical assessment is worthwhile when symptoms such as persistently low libido, erectile difficulties, unexplained fatigue, reduced muscle strength or other significant changes continue over time. Symptoms alone cannot establish whether testosterone is low, so appropriate blood testing is generally required before making a diagnosis.

It is particularly worth seeking advice when symptoms develop alongside fertility problems, testicular changes, previous testicular injury or surgery, pituitary disease, or treatment that could affect testosterone production.

Testosterone should not generally be used simply to address normal ageing or non-specific symptoms without evidence of deficiency. Professional assessment is important because treatment may affect fertility and requires consideration of potential benefits, risks and appropriate monitoring.

Quick Questions:

What are the most common symptoms of low testosterone?

Possible symptoms include reduced libido, erectile difficulties, fatigue, low mood, reduced muscle mass or strength and changes in body composition. Long-term significant deficiency can also affect bone health.

What causes testosterone levels to become low?

Causes can include conditions affecting the testes, pituitary or hypothalamus, certain medications, obesity, chronic illness and some genetic conditions. Testosterone levels also tend to decline gradually with age.

How is low testosterone diagnosed?

Diagnosis usually involves assessing symptoms alongside blood tests measuring testosterone levels. Because testosterone naturally varies during the day, testing is typically performed in the morning and an abnormal result may need to be confirmed with another test.

Does low testosterone always require testosterone replacement therapy?

No. Management depends on the symptoms, blood-test results and underlying cause. Some contributing factors may be reversible or require treatment of another condition, while testosterone replacement may be considered for appropriately diagnosed testosterone deficiency.