Low testosterone (hypogonadism) can be associated with several possible symptoms, including: decreased libido (reduced sexual desire), erectile dysfunction, persistent low energy or fatigue, loss of muscle mass and strength, increased body fat especially around the abdomen, mood changes (feeling depressed, irritability, difficulty concentrating), reduced facial and body hair, decreased bone density which can raise fracture risk, and sometimes signs related to anemia. These symptoms vary between people and may be caused by other health conditions. For evaluation you can start with a primary care doctor or an internal medicine physician; depending on the findings you may be referred to Endocrinology and Metabolic Diseases or Urology. The doctor will take a medical history and perform a physical exam; if needed they may order blood tests to measure hormone levels and other targeted evaluations. If you have sudden severe chest pain, severe shortness of breath, fainting or loss of consciousness, sudden severe headache, concerning psychiatric symptoms, or thoughts of self-harm, seek emergency care immediately. Low-risk lifestyle measures (regular sleep, routine physical activity including resistance exercises, balanced nutrition, and reducing smoking or excessive alcohol) can support symptoms and general health, but should be discussed with a clinician as part of overall care.