Get Started
Complete the short form belowto Contact a Nexel Medical physician
There can be many causes of low testosterone. Let’s take a look at 14 of the proven clinical causes of low testosterone and how low-T is diagnosed and treated.
Testosterone is often thought of only as a male sex hormone or androgen. Yet it does much more than support sex drive. In men, healthy testosterone levels help maintain muscle, bone strength, sperm production, red blood cell production, mood, focus, and physical drive. Women also make and need testosterone, though in much smaller amounts.
Low testosterone does not have one single cause. Some people have a problem in the testicles or ovaries, where testosterone is made. Others have a problem in the brain signals that tell the body to make it. Weight gain, poor sleep, long-term illness, certain medicines, and severe stress on the body may also lower hormone output.
The cause matters because treatment should never begin with a guess. A proper evaluation looks at symptoms, blood test results, health history, medicine use, and other possible hormone problems. This helps determine whether low testosterone is temporary, linked to another health issue, or likely to need direct hormone treatment.
Hypogonadism is the medical term for a condition in which the body does not make enough sex hormones. In men, it most often means the testicles are not making enough testosterone. It may also mean the brain is not sending the right signals to the testicles.
Doctors often divide male hypogonadism into two main types. Primary hypogonadism begins in the testicles. The brain may send the right message, but the testicles cannot respond as they should. Secondary hypogonadism begins in the pituitary gland or hypothalamus. These parts of the brain control the hormone signals that tell the testicles to make testosterone.
Low testosterone is not diagnosed from symptoms alone. Tiredness, low sex drive, weight gain, low mood, and poor focus can have many causes. A diagnosis usually requires symptoms that fit low testosterone along with the results on more than one testosterone blood test.
A man may also have functional low testosterone. This means the hormone system has slowed because of a factor such as obesity, poor sleep, severe illness, or certain medicines. In some cases, treating the cause may help testosterone levels improve. In other cases, the low level may continue and need additional care.
Low testosterone may begin in the hormone-producing organs or in the brain centers that control them. Here are the 14 best known and clinically proven causes of low testosterone.
Some men have more than one cause at the same time. For example, a man over 45 may have age-related decline along with obesity, sleep apnea, diabetes, and medicine use. A complete evaluation is needed to find the factors that can be treated or improved.
A man does not need to be old to have low testosterone. Men in their 30s may develop low levels because of a testicular problem, a brain signal problem, a health condition, medicine use, or a mix of lifestyle and medical factors.
Being obese or overweight is one common factor in younger adults. Body fat does not simply store energy. It can affect hormone balance and increase the conversion of testosterone into estrogen. This may create a cycle in which low testosterone makes it harder to keep muscle and control body fat, while added body fat places more pressure on testosterone levels.
Sleep also matters. Men who work long hours, rotate shifts, stay up late, or live with untreated sleep apnea may not get enough deep, steady sleep. Testosterone release follows a daily rhythm and is closely tied to sleep. Poor sleep may lower morning levels and also cause fatigue, low mood, and poor focus that feel like low testosterone.
Men in their 30s may also use medicines that suppress testosterone. Opioid pain medicines are a well-known example. Long courses of corticosteroids may also affect the hormone system. Use of anabolic steroids or testosterone without medical guidance can shut down natural production. When these drugs are stopped, the body may take time to restart its own hormone signals. Some men may not recover fully without care.
Other possible causes include testicular injury, past cancer treatment, genetic conditions, pituitary disease, high prolactin, diabetes, and severe stress on the body. Fertility concerns may be the first clue. A younger man who has low sex drive, fewer morning erections, reduced strength, or trouble conceiving should not assume he is too young for testing.
After age 45, natural hormone decline becomes a more likely part of the picture, but age alone should not be blamed for every low result. Many men keep healthy testosterone levels well into later life. Others develop a faster or more meaningful decline because aging is combined with changes in weight, sleep, activity, and health.
Muscle mass may fall when a man becomes less active. Body fat may then rise, especially around the waist. This change can weaken hormone balance and make the effects of low testosterone more noticeable. It may also raise the risk of insulin resistance and type 2 diabetes, which are often linked with lower testosterone levels.
Sleep apnea becomes more common with age and weight gain. A man may snore loudly, stop breathing for short periods, wake with headaches, or feel tired after a full night in bed. Because sleep apnea can lower sleep quality and place stress on the heart and brain, it should be evaluated rather than treated as simple aging.
Men over 45 are also more likely to use several medicines or live with chronic health problems. Opioids, corticosteroids, major illness, liver disease, kidney disease, and poorly controlled diabetes may all affect testosterone. Past surgery, radiation, chemotherapy, or head injury may remain important even when the event happened many years earlier.
The right question is not only, “Is my testosterone low?” It is also, “Why is it low?” Finding the cause helps the provider decide whether lifestyle changes, treatment of another condition, a medicine review, or testosterone replacement therapy may be appropriate.
Low testosterone can affect sexual health, physical function, and emotional well-being. The pattern is often more useful than any one symptom. A single bad week does not prove a hormone problem, but ongoing changes deserve attention.
Common signs may include:
These symptoms overlap with sleep problems, depression, thyroid disease, anemia, diabetes, medicine side effects, and many other conditions. That is why blood testing and a full health review are important. Treatment should be based on confirmed low levels and a clear clinical need, not symptoms alone.
Women make testosterone in the ovaries and adrenal glands. Their levels are much lower than men’s levels, but the hormone still helps support sexual desire, muscle, bone, energy, and a sense of well-being.
Testosterone may fall as a woman ages, especially during and after menopause. The ovaries make less estrogen, progesterone, and testosterone over time. Surgical removal of both ovaries can cause a faster and sharper drop because a major source of testosterone is removed at once.
Problems with the pituitary gland or adrenal glands may also lower testosterone. These glands help control or produce several hormones. A tumor, injury, surgery, radiation, or other disease may disrupt that system.
Certain medicines can play a role. Long-term corticosteroid use may suppress adrenal hormone production. Some hormonal birth control methods and oral estrogen can raise a blood protein called SHBG. This protein binds to testosterone and may reduce the amount that is free for the body to use. Cancer treatment, severe illness, very low calorie intake, and major weight loss may also affect sex hormone levels.
Low testosterone in women is more complex to diagnose than it is in men. Symptoms can overlap with low estrogen, menopause, thyroid problems, iron deficiency, depression, stress, poor sleep, and relationship concerns. Blood results must be reviewed in context rather than treated as a stand-alone answer.
Women with low testosterone may notice changes in sexual interest, physical drive, strength, or mood. However, no single symptom proves that testosterone is the cause.
Possible symptoms include:
Menopause can cause many of the same changes, especially when estrogen levels are also low. Vaginal dryness, painful sex, hot flashes, and night sweats are more often tied to estrogen loss than to testosterone alone. A proper hormone evaluation should consider the full pattern rather than focusing on one hormone.
Women should not use a man’s testosterone product or dose. Female treatment, when appropriate, requires careful dosing and follow-up because too much testosterone may cause acne, unwanted hair growth, scalp hair loss, voice changes, or other side effects.
Diagnosis begins with a conversation. The provider asks about symptoms, when they began, sexual health, sleep, weight changes, fertility goals, past injuries, surgeries, cancer treatment, medicine use, and long-term health conditions.
A physical exam may look for changes in body hair, muscle, breast tissue, testicle size, waist size, blood pressure, and other signs. The provider may also look for clues of sleep apnea, diabetes, thyroid disease, or a pituitary problem.
Hormone testing is the key to an accurate diagnosis. In men, total testosterone is usually checked early in the morning, when levels are often highest. A low result normally needs to be confirmed with a second early morning test on a different day. The diagnosis should combine repeated low results with symptoms or signs that fit testosterone deficiency.
Additional tests may include free testosterone or SHBG when total testosterone does not tell the full story. Luteinizing hormone, called LH, and follicle-stimulating hormone, called FSH, can help show whether the problem begins in the testicles or in the brain signals. Prolactin may be checked when a pituitary cause is possible.
Other blood work may include a complete blood count, thyroid tests, blood sugar testing, liver or kidney tests, and iron studies. A pituitary MRI may be needed when blood work, headaches, vision changes, or very low hormone levels suggest a pituitary disorder.
Women require a more personal review. Their provider may consider testosterone, SHBG, estrogen, thyroid function, adrenal health, menopause status, symptoms, and medicine use. The goal is to identify the full cause of the symptoms, not simply find one result outside a lab range.
Preparation can affect the value of the test. Follow the exact directions given by your doctor or the ordering provider or lab.
Men are often asked to have testosterone drawn early in the morning, commonly between 7:00 and 10:00 a.m. Levels change through the day and may be lower later. Shift workers or men with unusual sleep hours may need different timing based on when they normally wake.
Fasting may be requested because eating can cause a short-term change in testosterone results. Water is usually allowed, but the lab should confirm its rules. A person should also avoid testing during a severe illness when possible. Fever, surgery, injury, poor sleep, and other major stress can briefly suppress testosterone and produce a result that does not reflect the usual level.
Tell the provider about all prescription drugs, over-the-counter medicines, hormones, supplements, opioids, steroids, and recent injections. Do not stop a prescribed medicine unless the provider tells you to do so. Also mention heavy exercise, major dieting, recent travel, overnight work, or very poor sleep before the test.
Arrive well hydrated and try to keep test conditions similar if a repeat blood draw is needed. Two tests taken at very different times or under very different conditions may be harder to compare.
Treatment depends on the cause, the patient’s symptoms, health risks, age, and fertility plans. There is no single plan that is right for everyone.
When a cause can be corrected, the first step may be to treat that problem. Weight loss, strength training, better sleep, treatment for sleep apnea, improved diabetes control, or a review of medicines may help the hormone system work better. A pituitary tumor, high prolactin, iron overload, or another medical disorder may need its own treatment.
Men with confirmed hypogonadism may be candidates for testosterone replacement therapy. TRT can be given in several forms, including injections, topical gels, creams, patches, or implanted pellets. The best form depends on patient choice, cost, comfort, dosing needs, and how steadily the product maintains hormone levels.
Treatment must be monitored. Follow-up may include testosterone levels, blood counts, symptom changes, side effects, and prostate-related care when appropriate. The dose should be adjusted to restore a healthy level, not push testosterone far above the normal range.
Fertility must be discussed before TRT begins. Outside testosterone can reduce the brain signals that support sperm production. A man who wants to have children soon may need a different approach that supports his own testosterone and sperm production instead of replacing testosterone directly.
Treatment for women is more limited and must be highly personal. A provider should first look for menopause-related estrogen loss, thyroid disease, medicine effects, sleep problems, and other causes. When testosterone is considered, the dose is far lower than a male dose and requires close follow-up.
Low testosterone care should begin with a complete diagnosis, not a rushed prescription.
Nexel Medical evaluates the symptoms, hormone test results, health history, medicine use, sleep, weight, and personal goals that may shape each patient’s condition. This careful approach helps identify whether the problem begins in the testicles, the brain signals, another health condition, or several factors working together.
When treatment is right for the patient, the medical team creates a personal plan based on confirmed needs. Care may include lifestyle guidance, treatment of related hormone concerns, and doctor-prescribed testosterone replacement therapy. Follow-up testing helps the provider adjust treatment, track progress, and keep hormone levels within a healthy target range.
While we operate clinic locations nationwide, patients may be able to complete parts of the process through telemedicine. Virtual treatment still requires a consultation with a licensed provider, proper testing, a valid prescription, and medication from a licensed pharmacy.
Do not let low energy, reduced strength, poor focus, weight changes, or sexual health concerns become your new normal. Contact Nexel Medical today to schedule your consultation and take the first step toward finding the cause of your low testosterone symptoms.
Yes. Testosterone may fall for a short time during severe illness, poor sleep, rapid weight loss, extreme calorie restriction, surgery, or major physical stress. A low result during one of these periods may not reflect a person’s usual hormone level. This is one reason providers often repeat the test and review the timing, health conditions, and recent events before making a diagnosis.
Ongoing stress may affect sleep, weight, eating habits, exercise, and the brain signals involved in hormone production. Stress alone does not explain every low result, but it can become part of a larger pattern. A provider should also check for medical causes rather than assuming stress is the only problem.
Some genetic conditions that affect testicular development or hormone signaling can run in families or occur because of a chromosome change. Klinefelter syndrome is one example. Most adult cases of low testosterone, however, are linked to aging, health conditions, body weight, sleep, medicines, injury, or several causes rather than a simple family pattern.
Regular strength and aerobic exercise usually support health. However, extreme training without enough food, rest, or recovery may place the body under stress and lower sex hormone output. Endurance athletes and men following severe diets may be at greater risk. The answer is not always to stop exercising, but to restore enough calories, sleep, and recovery.
Treating sleep apnea may improve sleep quality, daytime energy, and overall health. Testosterone levels may also improve in some men, especially when treatment is paired with weight management. Results vary, so a man with confirmed low testosterone may still need further evaluation after his sleep apnea is under control.
No. A vasectomy blocks sperm from entering the semen, but it does not remove the testicles or stop them from making testosterone. Testosterone continues to enter the bloodstream as before. Symptoms that begin after a vasectomy should be evaluated, but another cause is usually responsible for a low testosterone level.
Complete The Short Form Below To Contact a Nexel Medical Physician
