Tired? Irritable? Jeans snugger than they used to be? Symptoms like these may well be a symptom of testosterone deficiency--- And you're not alone. Many men suffer from a condition known as hypogonadism – where the testes produce an unusually low level of testosterone, or dry up altogether.
 
What are the symptoms of testosterone deficiency?
 
Simply put, low energy levels, mood swings, irritability, poor concentration, reduced muscle strength and low sex drive can be symptoms of androgen deficiency (low testosterone). Symptoms often overlap with those of other illnesses. The symptoms of androgen deficiency are different for men of different ages.
 
Stages Of life and Possible Symptoms:
 
Early childhood
• penis and testes do not grow to expected size
 
Early teenage years (puberty)
• failure to go through full normal puberty
• poor development of facial, body or pubic hair
• poor muscle development
• voice does not deepen
• poor growth
• breast development (gynaecomastia)
 
Adulthood
• mood changes (low mood and irritability)
• poor concentration
• low energy
• reduced muscle strength
• increased body fat
• longer time to recover from exercise
• decreased libido (low interest in sex)
• difficulty getting and keeping erections
• low semen volume
• reduced beard or body hair growth
• breast development (gynaecomastia)
• hot flushes, sweats
• osteoporosis (thinning of bones)

Later life (after 60 years)
• mood changes (low mood and irritability)
• poor concentration
• easily fatigued
• poor muscle strength
• increased body fat
• decreased libido (low interest in sex)
• difficulty getting and keeping erections
• breast development (gynaecomastia)
• osteoporosis (thinning of bones)
  
What causes androgen deficiency?
Androgen deficiency can be caused by genetic disorders, medical problems, or damage to the testes or pituitary gland. Androgen deficiency happens when there are problems within the testes or with hormone production in the brain. A common chromosomal disorder that causes androgen deficiency is Klinefelter’s syndrome.