Hypoactive sexual desire disorder (HSD)
Hypoactive sexual desire (HSD) is the most common form of female sexual dissatisfaction (FSD) and occurs when there is a persistent lack of desire or absence of sexual fantasies. In other words, you're rarely in the mood and you neither initiate sex nor seek stimulation.

(1) Causes
Personal causes, like relationship conflicts or life style factors, often influence the desire for sex. Communications problems, anger, a lack of trust, a lack of connection and a lack of intimacy can all adversely affect a woman's sexual response and interest.

Medical Causes can sometimes be the underlying cause of low libido or low sex drive, including:
• Drugs, such as antihypertensives, antidepressants and birth control pills, interfere with sex drive, arousal and orgasm by affecting the balance of sexual hormones and the transmission of chemical messengers.
• Menopause is characterized by a gradual decline of the natural hormones estrogen, progesterone and testosterone, what can lead to a "sudden or gradual" decline in libido.

(2) Treatment
The No. 1 treatment option to overcome HSDs personal causes is probably a counsel and therapy with your partner.
To work against the medical causes, you can do something for balancing your hormonal levels, for example with alternative medicine without side effects instead of risky hormone replacement therapy.