Men also have hormonal cycles. If the key hormone in a woman’s body is estrogen, in man it is testosterone. Able to generate in man his behaviors such as sexual desire, creativity, concentration and provide male characters such as body hair, deep voice among others, testosterone has effects on the central nervous system, which determines how we feel and regulates the mood. Depending on the testosterone levels, the man can suffer in different occasions, symptoms of depression, sadness, insomnia or irritability, however, his cycles are not as prolonged as those of the woman.