Hypogonadism & Low Testosterone: Causes, Symptoms & Effective Treatments

1 Apr 2026

Hypogonadism: A Complete Guide to Causes, Symptoms & Treatment

Hypogonadism is a medical condition where the body doesn’t produce enough sex hormones, especially testosterone in people with testicles. Testosterone is essential for many aspects of health, including sexual development, muscle mass, energy levels, mood, fertility, and overall wellbeing.

What Is Hypogonadism?

Hypogonadism occurs when the gonads (testes in males, ovaries in females) produce insufficient amounts of sex hormones. In males, this most often means low testosterone, which can affect both physical and reproductive health.

There are two main types:

• Primary hypogonadism – The gonads themselves don’t function properly.
• Secondary hypogonadism – The brain (hypothalamus or pituitary gland) fails to signal the gonads to produce hormones correctly.

Common Causes

Hypogonadism can develop at any age, from birth through adulthood. Causes vary depending on whether the condition is primary or secondary:

Primary Causes

Genetic conditions such as Klinefelter syndrome
Undescended testicles from birth
Injury to the testicles
Inflammation like orchitis
Effects of cancer treatment (chemotherapy or radiation)

Secondary Causes

Disorders of the pituitary gland or hypothalamus
Hormonal disorders
Obesity and metabolic conditions
Chronic illnesses
Certain medications (like opioids)
Aging processes that naturally lower hormone production

Symptoms to Watch For

Symptoms vary based on age and the severity of hormone deficiency. In adults, hypogonadism may include:

Reduced libido (sex drive)
Fatigue and low energy
Reduced muscle mass and strength
Difficulty with erections (erectile dysfunction)
Increased body fat
Gynecomastia (breast growth in males)
Depression, irritability and trouble concentrating
Infertility or reduced sperm production

In children or teens, hypogonadism may delay puberty or slow development of secondary sexual characteristics such as voice deepening and body hair growth.

Diagnosis

Diagnosis usually begins with a physical exam and a review of symptoms. Doctors will order blood tests to measure hormone levels — typically including testosterone, luteinizing hormone (LH), follicle‑stimulating hormone (FSH), and others.

Hormone levels are often highest in the morning, so tests are normally done early in the day. Further testing may include imaging of hormonal glands or genetic studies when needed.

Treatment Options

Treatment depends on the cause of hypogonadism and your health goals:

• Testosterone Replacement Therapy (TRT)
Raising hormone levels with testosterone can help reduce symptoms such as low sex drive, fatigue, and loss of muscle mass. TRT is available in injections, gels, patches, or implants and is tailored to individual needs.

• Addressing Underlying Causes
In cases of secondary hypogonadism caused by lifestyle or medical issues (like obesity or pituitary disorders), treatment may focus on those root problems.

• Fertility Concerns
If fertility is a priority — such as in younger adults — other hormone‑based treatments may be considered to protect sperm production.

Why Early Detection Matters

Hypogonadism does not always present obvious symptoms, and early detection can help:

Prevent long‑term complications like decreased bone density (osteoporosis)
Improve quality of life with appropriate therapies
Address underlying health conditions linked with hormone imbalance

Summary

Hypogonadism is a common but often under‑recognized hormonal condition. It can present across the lifespan and is usually treatable once diagnosed. Understanding the causes and symptoms helps you get the right care — whether through lifestyle changes, targeted hormone therapies, or specialist evaluation.