What is low testosterone (Low T) in men? Symptoms, causes, & prevention
What is low testosterone?
Struggling with fatigue, low sex drive, or brain fog? Learn the symptoms and causes of Low T and how to naturally support healthy testosterone levels.
Low testosterone (often called Low T) happens when a man’s body doesn't produce enough testosterone, the hormone responsible for sex drive, muscle mass, bone strength, mood, and energy.
While testosterone levels naturally decline with age (starting around age 30), some men experience a more significant drop that impacts their quality of life.
A testosterone level below 300 ng/dL is generally considered low.
Common symptoms of low testosterone
If your testosterone levels are lower than normal, you might notice:
Low libido (reduced sex drive)
Erectile dysfunction (difficulty getting or keeping an erection)
Infertility (difficulty getting a partner pregnant)
Shrinking testicles
Reduced muscle mass or strength
Unexplained weight gain or increased body fat
Less facial or body hair
Fatigue or low energy
Mood changes (irritability, sadness, even depression)
Difficulty concentrating (brain fog)
What causes low testosterone?
Low T can be caused by various age-related, medical, or lifestyle factors. The most common causes include:
Aging (especially after age 30–40)
Obesity or excessive weight gain
Type 2 diabetes (especially if uncontrolled)
Sleep apnea
Chronic illnesses (kidney, liver disease)
Injury or trauma to the testicles
Certain medications (especially steroids or opioids)
Hormonal disorders (pituitary gland problems)
Infections or inflammation
Can low testosterone be prevented?
There are no known ways to prevent low testosterone caused by genetic conditions or damage to the testicles or pituitary gland.
However, there are key lifestyle habits that may help you maintain healthy testosterone levels as you age. They include:
Regular exercise, such as strength training and cardiovascular exercise.
Maintaining a healthy weight.
Eating a healthy diet that includes whole foods, lean proteins, healthy fats, and plenty of fruits and vegetables.
Getting 7-9 hours of sleep per night.
Reducing stress.
Limiting alcohol and avoiding drug use.
When should you see a doctor for low testosterone?
If you're over 30 and noticing symptoms like low sex drive, fatigue, weight gain, or brain fog, it's time to consider testing for Low T.
You should talk to a doctor if:
You have ongoing erectile dysfunction or low libido
You’re tired all the time – even with good sleep
You’ve gained belly fat or lost muscle
You feel depressed, irritable, or mentally “off”
You’re struggling to focus or feel like your drive is gone
Do not dismiss your symptoms of low testosterone as a natural part of getting older.
If you’re experiencing any symptoms, talk to a healthcare provider to get tested and treated.
