Hypogonadism is a medical condition that refers to the inadequate production of sex hormones. This condition can lead to many unpleasant symptoms, such as low libido, erectile dysfunction, mood swings, and reduced muscle mass. There are many synonyms that can be used to describe hypogonadism, including androgen deficiency, testosterone deficiency syndrome, testicular failure, gonadal dysfunction, and reproductive hormonal deficiency. While the exact cause of hypogonadism can vary, it is most commonly associated with aging or damage to the testicles. Treatment options may include hormone replacement therapy or lifestyle changes such as diet and exercise.