What are the symptoms of testosterone deficiency

Testosterone is the main male androgen, which is an important hormone mainly used to maintain some male sexual functions and physiological characteristics. If testosterone secretion is insufficient, it has different effects on male adolescence, middle age and old age, mainly for male sexual desire and normal maintenance of sexual function. For example, if secretion is insufficient before puberty, it can lead to delayed development of secondary sexual characteristics. For normal adult males, If the secretion is insufficient, it can lead to multi-system multi-organ dysfunction, menopause syndrome, and some cases of low libido, sparse pubic hair and beard. For middle-aged men, it can lead to loss of libido, memory loss, etc.