Hypothyroidism refers to an underproduction of thyroid hormone.  This is a very common condition that increases with advancing age.  In fact, it is estimated that up to 25 percent of the population in this country are mildly hypothyroid.  Only one to four per cent of the adult population is estimated to have moderate to severe hypothyroidism, which can actually be detected by blood tests....

The inability to achieve or maintain an erection, premature ejaculation, and the inability to ejaculate makes it impossible for the male to impregnate the ovum of the female.  This is defined as impotence or an inability to have an erection that is adequate for normal intercourse and penetration.  Impotence may be psychological or organic in nature....

Indigestion may be a symptom of a disorder in the stomach, the small or large intestine, or it may be a disorder in and of itself.  Symptoms can include abdominal pain, belching, bloating, intestinal gas, heartburn (See “Heartburn”), nausea, and vomiting.  The gas of indigestion results from fermentation of food in the colon that produces hydrogen and carbon dioxide.  Carbohydrates are the main food source responsible for gas due to the bacteria they contain....

Infertility is the inability to become pregnant after a year or more of regular sexual activity during the time of ovulation. It is also the inability to carry a pregnancy full-term.  The most common cause of infertility is a hormonal imbalance....

Habitual sleeplessness, repeated night after night, is classified as insomnia.  Insomnia is an extremely common complaint.  In sleep laboratories, psychological factors are demonstrated to account for half of all insomnia.  It is also closely associated with depression....