Men's Health
Low Testosterone in Men: Symptoms, Causes and Evaluation
October 7, 2026 Vitality Medicine RX Editorial Team
Low testosterone, also called hypogonadism, is diagnosed when symptoms are present together with blood levels below the reference range, usually confirmed on more than one occasion. Symptoms such as fatigue, low libido and low mood can have many causes, which is why evaluation matters. Vitality Medicine RX offers nurse practitioner-led telehealth evaluation for low testosterone in states where Dr. Miklos Major II, Sc.D., DNP, NP-BC, FAAMFM holds an active license.
Common symptoms
- Persistent fatigue and low energy
- Reduced sex drive and erectile difficulty
- Low mood, irritability or brain fog
- Poor sleep and reduced muscle mass
- Increased body fat, especially around the middle
Possible causes
Low testosterone is usually multifactorial. Aging, obesity, sleep apnea, chronic illness, medications, pituitary or testicular conditions, stress and poor sleep can all contribute. Identifying which factors apply to you guides both evaluation and treatment.
How it is evaluated
Evaluation combines symptoms with blood testing: total and free testosterone, estradiol, LH and FSH, prolactin when indicated, a complete blood count, metabolic panel and PSA in age-appropriate men, plus thyroid markers as appropriate.
What this means for you
A single low number is not a diagnosis. Symptoms and labs are considered together, and treatment is considered only when the full picture supports it.
When to talk to a clinician
If you have symptoms that may relate to low testosterone, book a discovery call to confirm we can see you in your state and to outline the evaluation steps.
Sources
Related Pages
Talk to a Clinician
This article is educational and does not replace individualized medical advice. If you have questions about your own health, book a discovery call with Vitality Medicine RX. Your care is led by Dr. Miklos Major II, Sc.D., DNP, NP-BC, FAAMFM, a Doctor of Nursing Practice (DNP) and Doctor of Science (Sc.D.), board-certified nurse practitioner (NP-BC). Care is available in states where he holds an active license.
Book a Discovery CallQuestions About This Topic
What is low testosterone?
Low testosterone, or hypogonadism, means testosterone levels are below the reference range together with symptoms. Diagnosis requires both symptom review and lab testing.
What causes low testosterone?
Causes are usually multifactorial and can include aging, obesity, sleep apnea, chronic illness, medications, pituitary or testicular conditions, stress and poor sleep.
How is low testosterone diagnosed?
Diagnosis combines symptoms with blood testing, typically total and free testosterone, ideally more than once, plus labs to rule out other contributing factors.
How do I get started?
Book a discovery call. We will confirm your state, review your symptoms and history, and outline the evaluation steps.
Last updated 2026-10-07.