You’ve probably heard about “low T.” Maybe you’ve seen ads for supplements or testosterone replacement therapy (TRT) that promise more energy, better workouts or a stronger sex drive. It can seem like a quick fix.
But low testosterone is not just a trend or a boost for feeling tired. It is a medical condition called hypogonadism. Like other health issues, it needs careful testing before starting any treatment. Sometimes, symptoms that look like low testosterone are caused by something else.
If you’re feeling off and wonder if low testosterone is the cause, here’s what you need to know.
What is testosterone and why it matters in men
Testosterone is a hormone made mainly in the testicles. It plays an important role in your body throughout your life.
Testosterone helps with:
- Sex drive (libido)
- Erections
- Muscle mass and strength
- Bone density
- Red blood cell production
- Mood and energy
“Testosterone levels naturally rise during puberty and early adulthood,” said Carlos Rivera, MD, an endocrinologist and metabolic medicine specialist with Banner University Medicine. “After age 30, these levels slowly decline, about 1% per year.”
Most men don’t feel the slow change in levels because their bodies adjust over time. Low testosterone occurs when your levels drop below what your body needs to function well (typically below 300 ng/dL). It can result in physical, emotional and sexual symptoms.
What are the symptoms of low testosterone?
When testosterone levels are very low, you might notice symptoms such as:
- Less interest in sex
- Difficulty getting or maintaining an erection
- Feeling tired all the time, even after sleep
- Brain fog or trouble concentrating
- Loss of muscle mass or strength
- More belly fat or growth of breast tissue (gynecomastia)
- Lower bone density
- Poor sleep
- Mood swings or feeling sad
- Fertility problems
The tricky part is that many of these symptoms can have other causes. That’s why you shouldn’t jump straight to testosterone therapy or over-the-counter (OTC) supplements.
Could it be something else causing your symptoms?
A few things can lower your testosterone. Some you can control, others you can’t. Before blaming low testosterone, it’s important to look at the bigger picture.
These common problems can cause similar symptoms:
Weight
Carrying extra fat, especially around your stomach, lowers your testosterone levels. Fat cells change testosterone into estrogen, a female hormone. The more fat you have, the less testosterone you have.
“This is the main reason men have low testosterone," said Dr. Rivera. "Losing weight, eating well and exercising can often fix this."
Poor sleep
Most of your testosterone is produced while you sleep. If you don’t get seven to nine hours of sleep or if your sleep is poor, especially if you have sleep apnea, your testosterone levels can drop quickly. Even one bad week of sleep can decrease your T by 10% to 15%.
Health problems
Some health problems can reduce testosterone. These include diabetes, metabolic conditions, high blood pressure and thyroid issues. Injuries to your testicles or chemotherapy can also cause low testosterone.
Stress
When you’re stressed, your body releases a chemical called cortisol. Cortisol blocks testosterone. So if work, money or family problems are wearing on you, your testosterone levels can pay the price.
Lifestyle
Heavy drinking, smoking and using opioids can all lower your testosterone levels. Some prescription drugs can do the same. Always ask your health care provider about possible side effects.
How low testosterone is properly diagnosed
A proper diagnosis requires more than a single blood test. Dr. Rivera said it requires at least two separate low results and symptoms.
“About one in three men with low T on the first test will have a normal second result,” he said. “That’s why repeat testing is important.”
Timing matters
Testosterone levels change throughout the day. They are highest in the morning, so blood tests should be done before 10 a.m. Your provider will tell you to fast, which means not eating before the test. Avoid testing if you are sick, because illness can lower your testosterone levels.
Looking for the cause
If your levels are low, your provider might order more tests, such as hormone tests for LH, FSH and prolactin, as well as iron levels and a blood count. Sometimes, imaging like a brain MRI is needed to check the pituitary gland. The goal is to find out not just if testosterone is low but why it’s low.
Treating low testosterone
Treatment works best when there is a clear, lasting cause. This helps your provider choose the right treatment for your needs and goals.
Lifestyle changes
If the cause is due to something like weight, sleep apnea or a medication, fixing those problems comes first.
This might include:
- Hitting the gym, especially lifting heavy weights
- Eating healthy foods and reducing sugar, junk food and alcohol
- Good sleep habits
- Adjusting your medication dosage
- Treating sleep apnea
- Managing depression
- Dropping pounds if you’re overweight
Testosterone replacement therapy
If lifestyle changes aren’t enough, your provider might suggest TRT. This treatment provides extra testosterone through various methods:
- Shots (injections)
- Skin patches
- Gels you rub on the skin
- Pellets placed under the skin
TRT can help. According to Dr. Rivera, many men feel better in just a few weeks, experiencing a better mood, increased sex drive and stronger workouts. However, TRT is not a quick fix.
It won’t reliably improve erection problems, boost energy or sharpen thinking and memory.
It may also cause side effects like acne, mood changes and lower sperm count and increase the risk of possible blood clots.
Important: Starting testosterone therapy is a long-term commitment. You will need blood tests after three to six months and then again after a year. If your blood gets too thick, your provider might lower or stop the treatment.
When testosterone therapy may not be the right choice
TRT can help some men but it isn't safe or right for everyone. You should avoid it if you have:
- A desire to have children now or in the future
- Prostate cancer or breast cancer
- A prostate nodule, a hard spot or a PSA blood test higher than 4 ng/mL
- Serious urinary problems from an enlarged prostate
- Thick blood, indicated by a high hematocrit
- Untreated sleep apnea
- A history of heart attack or stroke in the last six months
- Uncontrolled heart failure
The U.S. Food and Drug Administration (FDA) warns that TRT is not proven to be safe or effective for men whose low levels are caused only by aging or being overweight.
The truth about OTC boosters and online TRT clinics
Walk into any supplement store or pharmacy and you will see testosterone boosters on the shelf. Online clinics also send ads to your phone, promising quick prescriptions and home delivery. Both raise serious concerns.
“OTC products like DHEA supplements hardly work," said Dr. Rivera. “Studies show they raise levels by a trivial amount that has no real effect on the body.”
The FDA does not approve these products and many don’t even contain the ingredients listed. But online clinics are a bigger problem.
A study of more than 250 websites selling testosterone found:
- Some providers prescribe testosterone without adequate testing
- Treatment may be offered even when levels are normal
- Claims of “anti-aging” benefits are not supported by evidence
- Costs are often much higher than standard care (about $1,600 to $4,200 per year, compared with $134 to $1,333 with insurance)
When to talk to your health care provider
You should see your provider if you have:
- Ongoing low sex drive
- Constantly tired
- Mood changes that affect your daily life
- Fertility concerns
- Physical changes like muscle loss
Bring a list of your symptoms and be honest about your habits. The more your provider knows, the sooner you can feel better.
Bottom line
Low T is real but it is often misunderstood. Symptoms alone aren’t enough to diagnose low testosterone.
If you think you might have symptoms of low T, talk to your health care provider. Your symptoms could be caused by low T or other health issues. Your provider can review your medical history and run tests to check your hormone levels. They can help you decide if you are a candidate for TRT or other treatment options.
Frequently asked questions
What is considered low testosterone?
Typically below 300 ng/dL but diagnosis depends on symptoms and repeat testing.
Can you raise testosterone naturally?
Making changes to your lifestyle, such as improving your sleep, losing weight and exercising, can help in some cases.
Is testosterone therapy safe long-term?
It can be safe for some men when properly prescribed and monitored. But it is not safe for everyone and carries risks.
Can TRT affect fertility?
Yes. It can reduce or stop sperm production. It should be avoided if you want to have children.
Do testosterone supplements work?
Most OTC products have not been proven effective or safe.
