The symptoms of low testosterone vary based on your age. In female adults, high levels of testosterone may be a sign of polycystic ovary syndrome (PCOS). High levels of testosterone in female infants may lead to enlargement of their clitoris that can look almost like a penis. It’s unlikely — and difficult to tell — that a male adult has higher-than-normal levels of testosterone.
These messenger hormones cause the telltale signs of puberty to begin. These hormones travel to the sex organs (gonads) — the ovaries or testes. GnRH stimulates your child’s pituitary gland to release two more hormones — luteinizing hormone (LH) and follicle-stimulating hormone (FSH). Puberty is the natural part of development when your child’s body goes through physical and hormonal changes to reach sexual maturity. Normal levels of testosterone may be achievable with hormone therapy and lifestyle adjustments. If a woman has symptoms of high or low testosterone, it’s recommended that she visit a healthcare provider to get further testing and a diagnosis.
Attention, memory, and spatial ability are key cognitive functions affected by testosterone in humans. In people who have undergone testosterone deprivation therapy, testosterone increases beyond the castrate level have been shown to increase the rate of spread of an existing prostate cancer. It regulates acute hypothalamic–pituitary–adrenal axis (HPA axis) response under dominance challenge. These include adult-type body odor, increased oiliness of skin and hair, acne, pubarche (appearance of pubic hair), axillary hair (armpit hair), growth spurt, accelerated bone maturation, and facial hair. It has been theorized that brain masculinization is occurring since no significant changes have been identified in other parts of the body. There is also development of the prostate gland and seminal vesicles.citation needed Examples include genital virilisation such as midline fusion, phallic urethra, scrotal thinning and rugation, and phallic enlargement; although the role of testosterone is far smaller than that of dihydrotestosterone.
The male brain is masculinized by the aromatization of testosterone into estradiol, which crosses the blood–brain barrier and enters the male brain, whereas female fetuses have α-fetoprotein, which binds the estrogen so that female brains are not affected. For postnatal effects in both males and females, these are mostly dependent on the levels and duration of circulating free testosterone. Since testosterone levels decrease as men age, testosterone is sometimes used in older men to counteract this deficiency. On average, in adult males, levels of testosterone are about seven to eight times as great as in adult females. The Role of Age in Setting Baseline Testosterone Levels for Diagnosis As men age, it is natural for their testosterone levels to decline.
Physical presence may be required for women who are in relationships for the testosterone–partner interaction, where same-city partnered women have lower testosterone levels than long-distance partnered women. Married men who engage in bond-maintenance activities such as spending the day with their spouse or child have no different testosterone levels compared to times when they do not engage in such activities. Falling in love has been linked with decreases in men's testosterone levels while mixed changes are reported for women's testosterone levels. Men who watch a sexually explicit movie have an average increase of 35% in testosterone, peaking at 60–90 minutes after the end of the film, but no increase is seen in men who watch sexually neutral films. The reflexive testosterone increases in male mice is related to the male's initial level of sexual arousal.
With increasing age, there is no change in epinephrine levels, but norepinephrine and total plasma catecholamine are increased. Adrenal androgen release is regulated by ACTH, whereas gonadal release of testosterone and estrogen are under a separate pathway of pituitary-gonadotrophic control. ACTH and cortisol production is constant over life in normal, unstressed individuals.

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