Osteoporosis causes bones to become less dense and more fragile. Some people are more at risk than others.
Bones are at their thickest and strongest in your early adult life and their density increases until your late 20s. But you gradually start losing bone density from around the age of 35.
This happens to everyone, but some people develop osteoporosis and lose bone density much faster than normal. This means they are at greater risk of a fracture.
Osteoporosis can affect men and women. It's more common in older people, but it can also affect younger people.
Women are more at risk of developing osteoporosis than men because the hormone changes that occur in the menopause directly affect bone density.
Women are at even greater risk of developing osteoporosis if they have:
In most cases, the cause of osteoporosis in men is unknown. However, there's a link to the male hormone testosterone, which helps keep the bones healthy.
Men continue producing testosterone into old age, but the risk of osteoporosis is increased in men with low levels of testosterone.
In around half of men, the exact cause of low testosterone levels is unknown, but known causes include:
Many hormones in the body can affect the process of bone turnover. If you have a condition of the hormone-producing glands, you may have a higher risk of developing osteoporosis.
Hormone-related conditions that can trigger osteoporosis include:
Other factors thought to increase the risk of osteoporosis and broken bones include:
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