Does low testosterone cause loss of libido?

Testosterone supports sexual desire and other body functions. Low levels may occur with problems affecting the testicles, pituitary gland, or general health. Symptoms can include fewer spontaneous erections, erectile difficulty, low energy, reduced muscle strength, low mood, or trouble concentrating, but these features are not specific. Poor sleep, depression, anxiety, relationship strain, pain, alcohol, some medicines, diabetes, thyroid problems, and other illnesses can also change libido. A diagnosis is not made from libido alone: a clinician usually considers your symptoms and confirms a low level with appropriately timed blood testing.

Arrange a medical appointment if the change is persistent, distressing, or accompanied by other symptoms. Write down when it began, whether desire varies with sleep or stress, and every medicine or supplement you take. Do not use testosterone products bought online or borrow someone else’s treatment; they can have important risks and may affect fertility. Better sleep, regular activity, reducing alcohol, and addressing mood or relationship concerns can support sexual wellbeing while the cause is being assessed.

Seek prompt medical advice for a sudden change with severe headache, vision changes, breast enlargement or discharge, testicular pain or swelling, marked weakness, or significant mood changes. Urgent help is needed for thoughts of self-harm. Mention fertility plans before any hormone treatment because testosterone therapy can reduce sperm production.

Ask whether your symptoms justify hormone testing, when testing should be repeated, and whether sleep, mood, medicines, weight, or another illness could explain the change. Discuss fertility, treatment alternatives, expected monitoring, and what improvement would be realistic.